diff --git a/.env.docker.example b/.env.docker.example
new file mode 100644
index 0000000..4fd9f6d
--- /dev/null
+++ b/.env.docker.example
@@ -0,0 +1,23 @@
+# =============================================================================
+# Task Reporter - Docker Environment Configuration
+# =============================================================================
+# Copy this file to .env.docker and customize for your deployment.
+# Use with: docker-compose -f docker-compose.minio.yml --env-file .env.docker up -d
+# =============================================================================
+
+# -----------------------------------------------------------------------------
+# MinIO Configuration
+# -----------------------------------------------------------------------------
+# MinIO admin username
+# IMPORTANT: Change this in production!
+MINIO_ROOT_USER=minioadmin
+
+# MinIO admin password
+# IMPORTANT: Use a strong password in production!
+MINIO_ROOT_PASSWORD=minioadmin
+
+# MinIO S3 API port (default: 9000)
+MINIO_API_PORT=9000
+
+# MinIO Web Console port (default: 9001)
+MINIO_CONSOLE_PORT=9001
diff --git a/.env.example b/.env.example
index fb0fd88..e8c4e11 100644
--- a/.env.example
+++ b/.env.example
@@ -1,33 +1,135 @@
+# =============================================================================
+# Task Reporter - Backend Environment Configuration
+# =============================================================================
+# Copy this file to .env and fill in the required values.
+# Required fields are marked with (Required), optional fields have defaults.
+# =============================================================================
+
+# -----------------------------------------------------------------------------
 # Database Configuration
-DATABASE_URL=postgresql://dev:dev123@localhost:5432/task_reporter
-# For development with SQLite (comment out DATABASE_URL above and use this):
-# DATABASE_URL=sqlite:///./task_reporter.db
+# -----------------------------------------------------------------------------
+# (Required) MySQL database connection string
+# Format: mysql+pymysql://user:password@host:port/database?charset=utf8mb4
+# Note: All tables use 'tr_' prefix to avoid conflicts in shared database
+DATABASE_URL=mysql+pymysql://user:password@localhost:3306/task_reporter?charset=utf8mb4
 
-# Security
-FERNET_KEY=  # Generate with: python -c "from cryptography.fernet import Fernet; print(Fernet.generate_key().decode())"
+# -----------------------------------------------------------------------------
+# Security Configuration
+# -----------------------------------------------------------------------------
+# (Required) Fernet encryption key for session token encryption
+# Generate with: python -c "from cryptography.fernet import Fernet; print(Fernet.generate_key().decode())"
+FERNET_KEY=
 
-# AD API
+# -----------------------------------------------------------------------------
+# Server Configuration
+# -----------------------------------------------------------------------------
+# Server bind address (default: 0.0.0.0)
+HOST=0.0.0.0
+
+# Server port (default: 8000)
+PORT=8000
+
+# Debug mode - set to False in production (default: False)
+DEBUG=True
+
+# Log level: DEBUG, INFO, WARNING, ERROR, CRITICAL (default: INFO)
+LOG_LEVEL=INFO
+
+# -----------------------------------------------------------------------------
+# CORS Configuration
+# -----------------------------------------------------------------------------
+# (Required for production) Comma-separated list of allowed CORS origins
+# Example: http://localhost:3000,https://your-domain.com
+# WARNING: Never use "*" in production - always specify allowed origins
+CORS_ORIGINS=http://localhost:3000
+
+# -----------------------------------------------------------------------------
+# System Administration
+# -----------------------------------------------------------------------------
+# System administrator email with special permissions (bypass room membership checks)
+# Leave empty if no system admin is needed
+SYSTEM_ADMIN_EMAIL=
+
+# -----------------------------------------------------------------------------
+# AD Authentication API
+# -----------------------------------------------------------------------------
+# (Required) Active Directory authentication API URL
 AD_API_URL=https://pj-auth-api.vercel.app/api/auth/login
 
+# AD API request timeout in seconds (default: 10)
+AD_API_TIMEOUT_SECONDS=10
+
+# -----------------------------------------------------------------------------
 # Session Settings
+# -----------------------------------------------------------------------------
+# Session inactivity timeout in days (default: 3)
 SESSION_INACTIVITY_DAYS=3
+
+# Token refresh threshold in minutes (default: 5)
 TOKEN_REFRESH_THRESHOLD_MINUTES=5
+
+# Maximum token refresh attempts (default: 3)
 MAX_REFRESH_ATTEMPTS=3
 
+# -----------------------------------------------------------------------------
+# Realtime Messaging Settings
+# -----------------------------------------------------------------------------
+# Message edit time limit in minutes - users can edit messages within this window (default: 15)
+MESSAGE_EDIT_TIME_LIMIT_MINUTES=15
+
+# Typing indicator timeout in seconds (default: 3)
+TYPING_TIMEOUT_SECONDS=3
+
+# -----------------------------------------------------------------------------
+# File Upload Limits
+# -----------------------------------------------------------------------------
+# Maximum image file size in MB (default: 10)
+IMAGE_MAX_SIZE_MB=10
+
+# Maximum document file size in MB (default: 20)
+DOCUMENT_MAX_SIZE_MB=20
+
+# Maximum log file size in MB (default: 5)
+LOG_MAX_SIZE_MB=5
+
+# -----------------------------------------------------------------------------
 # MinIO Object Storage Configuration
-# For local development, use docker-compose.minio.yml to start MinIO
+# -----------------------------------------------------------------------------
+# MinIO server endpoint (default: localhost:9000)
 MINIO_ENDPOINT=localhost:9000
+
+# MinIO access key (default: minioadmin)
+# IMPORTANT: Change this in production!
 MINIO_ACCESS_KEY=minioadmin
+
+# MinIO secret key (default: minioadmin)
+# IMPORTANT: Change this in production!
 MINIO_SECRET_KEY=minioadmin
+
+# MinIO bucket name (default: task-reporter-files)
 MINIO_BUCKET=task-reporter-files
-MINIO_SECURE=false  # Set to true for HTTPS in production
 
+# Use HTTPS for MinIO connection (default: false)
+# Set to true in production with proper TLS configuration
+MINIO_SECURE=false
+
+# -----------------------------------------------------------------------------
 # DIFY AI Service Configuration
-# Used for AI-powered incident report generation
+# -----------------------------------------------------------------------------
+# DIFY API base URL for AI-powered report generation
 DIFY_BASE_URL=https://dify.theaken.com/v1
-DIFY_API_KEY=  # Required: Get from DIFY console
-DIFY_TIMEOUT_SECONDS=120  # Timeout for AI generation requests
 
+# (Required for AI reports) DIFY API key - get from DIFY console
+DIFY_API_KEY=
+
+# DIFY API request timeout in seconds - AI generation can be slow (default: 120)
+DIFY_TIMEOUT_SECONDS=120
+
+# -----------------------------------------------------------------------------
 # Report Generation Settings
-REPORT_MAX_MESSAGES=200  # Summarize older messages if room exceeds this count
-REPORT_STORAGE_PATH=reports  # MinIO path prefix for generated reports
+# -----------------------------------------------------------------------------
+# Maximum messages to include in report before summarization (default: 200)
+REPORT_MAX_MESSAGES=200
+
+# MinIO path prefix for generated reports (default: reports)
+REPORT_STORAGE_PATH=reports
diff --git a/alembic.ini b/alembic.ini
new file mode 100644
index 0000000..c10d4ca
--- /dev/null
+++ b/alembic.ini
@@ -0,0 +1,116 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = alembic
+
+# template used to generate migration file names; The default value is %%(rev)s_%%(slug)s
+# Uncomment the line below if you want the files to be prepended with date and time
+# see https://alembic.sqlalchemy.org/en/latest/tutorial.html#editing-the-ini-file
+# for all available tokens
+# file_template = %%(year)d_%%(month).2d_%%(day).2d_%%(hour).2d%%(minute).2d-%%(rev)s_%%(slug)s
+
+# sys.path path, will be prepended to sys.path if present.
+# defaults to the current working directory.
+prepend_sys_path = .
+
+# timezone to use when rendering the date within the migration file
+# as well as the filename.
+# If specified, requires the python>=3.9 or backports.zoneinfo library.
+# Any required deps can installed by adding `alembic[tz]` to the pip requirements
+# string value is passed to ZoneInfo()
+# leave blank for localtime
+# timezone =
+
+# max length of characters to apply to the
+# "slug" field
+# truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+# version location specification; This defaults
+# to alembic/versions.  When using multiple version
+# directories, initial revisions must be specified with --version-path.
+# The path separator used here should be the separator specified by "version_path_separator" below.
+# version_locations = %(here)s/bar:%(here)s/bat:alembic/versions
+
+# version path separator; As mentioned above, this is the character used to split
+# version_locations. The default within new alembic.ini files is "os", which uses os.pathsep.
+# If this key is omitted entirely, it falls back to the legacy behavior of splitting on spaces and/or commas.
+# Valid values for version_path_separator are:
+#
+# version_path_separator = :
+# version_path_separator = ;
+# version_path_separator = space
+version_path_separator = os  # Use os.pathsep. Default configuration used for new projects.
+
+# set to 'true' to search source files recursively
+# in each "version_locations" directory
+# new in Alembic version 1.10
+# recursive_version_locations = false
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+sqlalchemy.url = driver://user:pass@localhost/dbname
+
+
+[post_write_hooks]
+# post_write_hooks defines scripts or Python functions that are run
+# on newly generated revision scripts.  See the documentation for further
+# detail and examples
+
+# format using "black" - use the console_scripts runner, against the "black" entrypoint
+# hooks = black
+# black.type = console_scripts
+# black.entrypoint = black
+# black.options = -l 79 REVISION_SCRIPT_FILENAME
+
+# lint with attempts to fix using "ruff" - use the exec runner, execute a binary
+# hooks = ruff
+# ruff.type = exec
+# ruff.executable = %(here)s/.venv/bin/ruff
+# ruff.options = --fix REVISION_SCRIPT_FILENAME
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S
diff --git a/alembic/README b/alembic/README
new file mode 100644
index 0000000..98e4f9c
--- /dev/null
+++ b/alembic/README
@@ -0,0 +1 @@
+Generic single-database configuration.
\ No newline at end of file
diff --git a/alembic/env.py b/alembic/env.py
new file mode 100644
index 0000000..6f32b7d
--- /dev/null
+++ b/alembic/env.py
@@ -0,0 +1,122 @@
+"""Alembic migrations environment configuration
+
+This configures Alembic to use the application's database settings
+and SQLAlchemy models for migration autogeneration.
+
+All tables use 'tr_' prefix to avoid conflicts in shared database.
+"""
+from logging.config import fileConfig
+import os
+import sys
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+# Add parent directory to path so we can import app modules
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+# Import settings and models
+from app.core.config import get_settings
+from app.core.database import Base
+
+# Import all models to register them with Base.metadata
+from app.modules.auth.models import UserSession, User
+from app.modules.chat_room.models import IncidentRoom, RoomMember, RoomTemplate
+from app.modules.realtime.models import Message, MessageReaction, MessageEditHistory
+from app.modules.file_storage.models import RoomFile
+from app.modules.report_generation.models import GeneratedReport
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Load database URL from settings
+settings = get_settings()
+config.set_main_option("sqlalchemy.url", settings.DATABASE_URL)
+
+# Custom version table name with tr_ prefix to avoid conflicts
+VERSION_TABLE = "tr_alembic_version"
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+target_metadata = Base.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def include_object(object, name, type_, reflected, compare_to):
+    """Filter to only include tables with 'tr_' prefix
+
+    This ensures migrations only affect Task Reporter tables
+    in the shared database.
+    """
+    if type_ == "table":
+        return name.startswith("tr_")
+    return True
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+        include_object=include_object,
+        version_table=VERSION_TABLE,
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            include_object=include_object,
+            version_table=VERSION_TABLE,
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()
diff --git a/alembic/script.py.mako b/alembic/script.py.mako
new file mode 100644
index 0000000..fbc4b07
--- /dev/null
+++ b/alembic/script.py.mako
@@ -0,0 +1,26 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision: str = ${repr(up_revision)}
+down_revision: Union[str, None] = ${repr(down_revision)}
+branch_labels: Union[str, Sequence[str], None] = ${repr(branch_labels)}
+depends_on: Union[str, Sequence[str], None] = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}
diff --git a/alembic/versions/d80670b4abcb_initial_migration_create_tr__prefixed_.py b/alembic/versions/d80670b4abcb_initial_migration_create_tr__prefixed_.py
new file mode 100644
index 0000000..0d71d8b
--- /dev/null
+++ b/alembic/versions/d80670b4abcb_initial_migration_create_tr__prefixed_.py
@@ -0,0 +1,200 @@
+"""Initial migration - create tr_ prefixed tables
+
+Revision ID: d80670b4abcb
+Revises: 
+Create Date: 2025-12-07 13:51:52.658701
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'd80670b4abcb'
+down_revision: Union[str, None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('tr_incident_rooms',
+    sa.Column('room_id', sa.String(length=36), nullable=False),
+    sa.Column('title', sa.String(length=255), nullable=False),
+    sa.Column('incident_type', sa.Enum('EQUIPMENT_FAILURE', 'MATERIAL_SHORTAGE', 'QUALITY_ISSUE', 'OTHER', name='incidenttype'), nullable=False),
+    sa.Column('severity', sa.Enum('LOW', 'MEDIUM', 'HIGH', 'CRITICAL', name='severitylevel'), nullable=False),
+    sa.Column('status', sa.Enum('ACTIVE', 'RESOLVED', 'ARCHIVED', name='roomstatus'), nullable=False),
+    sa.Column('location', sa.String(length=255), nullable=True),
+    sa.Column('description', sa.Text(), nullable=True),
+    sa.Column('resolution_notes', sa.Text(), nullable=True),
+    sa.Column('created_by', sa.String(length=255), nullable=False),
+    sa.Column('created_at', sa.DateTime(), nullable=False),
+    sa.Column('resolved_at', sa.DateTime(), nullable=True),
+    sa.Column('archived_at', sa.DateTime(), nullable=True),
+    sa.Column('last_activity_at', sa.DateTime(), nullable=False),
+    sa.Column('last_updated_at', sa.DateTime(), nullable=False),
+    sa.Column('ownership_transferred_at', sa.DateTime(), nullable=True),
+    sa.Column('ownership_transferred_by', sa.String(length=255), nullable=True),
+    sa.Column('member_count', sa.Integer(), nullable=False),
+    sa.PrimaryKeyConstraint('room_id')
+    )
+    op.create_index('ix_tr_incident_rooms_created_by', 'tr_incident_rooms', ['created_by'], unique=False)
+    op.create_index('ix_tr_incident_rooms_status_created', 'tr_incident_rooms', ['status', 'created_at'], unique=False)
+    op.create_table('tr_room_templates',
+    sa.Column('template_id', sa.Integer(), autoincrement=True, nullable=False),
+    sa.Column('name', sa.String(length=100), nullable=False),
+    sa.Column('description', sa.Text(), nullable=True),
+    sa.Column('incident_type', sa.Enum('EQUIPMENT_FAILURE', 'MATERIAL_SHORTAGE', 'QUALITY_ISSUE', 'OTHER', name='incidenttype'), nullable=False),
+    sa.Column('default_severity', sa.Enum('LOW', 'MEDIUM', 'HIGH', 'CRITICAL', name='severitylevel'), nullable=False),
+    sa.Column('default_members', sa.Text(), nullable=True),
+    sa.Column('metadata_fields', sa.Text(), nullable=True),
+    sa.PrimaryKeyConstraint('template_id'),
+    sa.UniqueConstraint('name')
+    )
+    op.create_table('tr_user_sessions',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('username', sa.String(length=255), nullable=False, comment='User email from AD'),
+    sa.Column('display_name', sa.String(length=255), nullable=False, comment='Display name for chat'),
+    sa.Column('internal_token', sa.String(length=255), nullable=False, comment='Internal session token (UUID)'),
+    sa.Column('ad_token', sa.String(length=500), nullable=False, comment='AD API token'),
+    sa.Column('encrypted_password', sa.String(length=500), nullable=False, comment='AES-256 encrypted password'),
+    sa.Column('ad_token_expires_at', sa.DateTime(), nullable=False, comment='AD token expiry time'),
+    sa.Column('refresh_attempt_count', sa.Integer(), nullable=False, comment='Failed refresh attempts counter'),
+    sa.Column('last_activity', sa.DateTime(), nullable=False, comment='Last API request time'),
+    sa.Column('created_at', sa.DateTime(), nullable=False),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_tr_user_sessions_id'), 'tr_user_sessions', ['id'], unique=False)
+    op.create_index(op.f('ix_tr_user_sessions_internal_token'), 'tr_user_sessions', ['internal_token'], unique=True)
+    op.create_table('tr_users',
+    sa.Column('user_id', sa.String(length=255), nullable=False, comment='User email address (e.g., ymirliu@panjit.com.tw)'),
+    sa.Column('display_name', sa.String(length=255), nullable=False, comment="Display name from AD (e.g., 'ymirliu 劉念蓉')"),
+    sa.Column('office_location', sa.String(length=100), nullable=True, comment="Office location from AD (e.g., '高雄')"),
+    sa.Column('job_title', sa.String(length=100), nullable=True, comment='Job title from AD'),
+    sa.Column('last_login_at', sa.DateTime(), nullable=True, comment='Last login timestamp'),
+    sa.Column('created_at', sa.DateTime(), nullable=False, comment='First login timestamp'),
+    sa.PrimaryKeyConstraint('user_id')
+    )
+    op.create_index('ix_tr_users_display_name', 'tr_users', ['display_name'], unique=False)
+    op.create_table('tr_generated_reports',
+    sa.Column('report_id', sa.String(length=36), nullable=False, comment='Unique report identifier (UUID)'),
+    sa.Column('room_id', sa.String(length=36), nullable=False, comment='Reference to incident room'),
+    sa.Column('generated_by', sa.String(length=255), nullable=False, comment='User email who triggered report generation'),
+    sa.Column('generated_at', sa.DateTime(), nullable=False, comment='Report generation timestamp'),
+    sa.Column('status', sa.String(length=30), nullable=False, comment='Current generation status'),
+    sa.Column('error_message', sa.Text(), nullable=True, comment='User-friendly error message if generation failed'),
+    sa.Column('dify_message_id', sa.String(length=100), nullable=True, comment='DIFY API message ID for tracking'),
+    sa.Column('dify_conversation_id', sa.String(length=100), nullable=True, comment='DIFY conversation ID'),
+    sa.Column('prompt_tokens', sa.Integer(), nullable=True, comment='Number of prompt tokens used'),
+    sa.Column('completion_tokens', sa.Integer(), nullable=True, comment='Number of completion tokens used'),
+    sa.Column('report_title', sa.String(length=255), nullable=True, comment='Generated report title'),
+    sa.Column('report_json', sa.JSON(), nullable=True, comment='Parsed AI output as JSON'),
+    sa.Column('docx_storage_path', sa.String(length=500), nullable=True, comment='Path to generated .docx file in MinIO or local storage'),
+    sa.ForeignKeyConstraint(['room_id'], ['tr_incident_rooms.room_id'], ondelete='CASCADE'),
+    sa.PrimaryKeyConstraint('report_id')
+    )
+    op.create_index('ix_tr_generated_reports_room_date', 'tr_generated_reports', ['room_id', 'generated_at'], unique=False)
+    op.create_index('ix_tr_generated_reports_status', 'tr_generated_reports', ['status'], unique=False)
+    op.create_table('tr_messages',
+    sa.Column('message_id', sa.String(length=36), nullable=False),
+    sa.Column('room_id', sa.String(length=36), nullable=False),
+    sa.Column('sender_id', sa.String(length=255), nullable=False),
+    sa.Column('content', sa.Text(), nullable=False),
+    sa.Column('message_type', sa.Enum('TEXT', 'IMAGE_REF', 'FILE_REF', 'SYSTEM', 'INCIDENT_DATA', name='messagetype'), nullable=False),
+    sa.Column('message_metadata', sa.JSON(), nullable=True),
+    sa.Column('created_at', sa.DateTime(), nullable=False),
+    sa.Column('edited_at', sa.DateTime(), nullable=True),
+    sa.Column('deleted_at', sa.DateTime(), nullable=True),
+    sa.Column('sequence_number', sa.BigInteger(), nullable=False),
+    sa.ForeignKeyConstraint(['room_id'], ['tr_incident_rooms.room_id'], ondelete='CASCADE'),
+    sa.PrimaryKeyConstraint('message_id')
+    )
+    op.create_index('ix_tr_messages_room_created', 'tr_messages', ['room_id', 'created_at'], unique=False)
+    op.create_index('ix_tr_messages_room_sequence', 'tr_messages', ['room_id', 'sequence_number'], unique=False)
+    op.create_index('ix_tr_messages_sender', 'tr_messages', ['sender_id'], unique=False)
+    op.create_table('tr_room_files',
+    sa.Column('file_id', sa.String(length=36), nullable=False),
+    sa.Column('room_id', sa.String(length=36), nullable=False),
+    sa.Column('uploader_id', sa.String(length=255), nullable=False),
+    sa.Column('filename', sa.String(length=255), nullable=False),
+    sa.Column('file_type', sa.String(length=20), nullable=False),
+    sa.Column('mime_type', sa.String(length=100), nullable=False),
+    sa.Column('file_size', sa.BigInteger(), nullable=False),
+    sa.Column('minio_bucket', sa.String(length=100), nullable=False),
+    sa.Column('minio_object_path', sa.String(length=500), nullable=False),
+    sa.Column('uploaded_at', sa.DateTime(), nullable=False),
+    sa.Column('deleted_at', sa.DateTime(), nullable=True),
+    sa.ForeignKeyConstraint(['room_id'], ['tr_incident_rooms.room_id'], ondelete='CASCADE'),
+    sa.PrimaryKeyConstraint('file_id')
+    )
+    op.create_index('ix_tr_room_files_room_uploaded', 'tr_room_files', ['room_id', 'uploaded_at'], unique=False)
+    op.create_index('ix_tr_room_files_uploader', 'tr_room_files', ['uploader_id'], unique=False)
+    op.create_table('tr_room_members',
+    sa.Column('id', sa.Integer(), autoincrement=True, nullable=False),
+    sa.Column('room_id', sa.String(length=36), nullable=False),
+    sa.Column('user_id', sa.String(length=255), nullable=False),
+    sa.Column('role', sa.Enum('OWNER', 'EDITOR', 'VIEWER', name='memberrole'), nullable=False),
+    sa.Column('added_by', sa.String(length=255), nullable=False),
+    sa.Column('added_at', sa.DateTime(), nullable=False),
+    sa.Column('removed_at', sa.DateTime(), nullable=True),
+    sa.ForeignKeyConstraint(['room_id'], ['tr_incident_rooms.room_id'], ondelete='CASCADE'),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('room_id', 'user_id', 'removed_at', name='uq_tr_room_member_active')
+    )
+    op.create_index('ix_tr_room_members_room_user', 'tr_room_members', ['room_id', 'user_id'], unique=False)
+    op.create_index('ix_tr_room_members_user', 'tr_room_members', ['user_id'], unique=False)
+    op.create_table('tr_message_edit_history',
+    sa.Column('edit_id', sa.Integer(), autoincrement=True, nullable=False),
+    sa.Column('message_id', sa.String(length=36), nullable=False),
+    sa.Column('original_content', sa.Text(), nullable=False),
+    sa.Column('edited_by', sa.String(length=255), nullable=False),
+    sa.Column('edited_at', sa.DateTime(), nullable=False),
+    sa.ForeignKeyConstraint(['message_id'], ['tr_messages.message_id'], ondelete='CASCADE'),
+    sa.PrimaryKeyConstraint('edit_id')
+    )
+    op.create_index('ix_tr_message_edit_history_message', 'tr_message_edit_history', ['message_id', 'edited_at'], unique=False)
+    op.create_table('tr_message_reactions',
+    sa.Column('reaction_id', sa.Integer(), autoincrement=True, nullable=False),
+    sa.Column('message_id', sa.String(length=36), nullable=False),
+    sa.Column('user_id', sa.String(length=255), nullable=False),
+    sa.Column('emoji', sa.String(length=10), nullable=False),
+    sa.Column('created_at', sa.DateTime(), nullable=False),
+    sa.ForeignKeyConstraint(['message_id'], ['tr_messages.message_id'], ondelete='CASCADE'),
+    sa.PrimaryKeyConstraint('reaction_id'),
+    sa.UniqueConstraint('message_id', 'user_id', 'emoji', name='uq_tr_message_reaction')
+    )
+    op.create_index('ix_tr_message_reactions_message', 'tr_message_reactions', ['message_id'], unique=False)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index('ix_tr_message_reactions_message', table_name='tr_message_reactions')
+    op.drop_table('tr_message_reactions')
+    op.drop_index('ix_tr_message_edit_history_message', table_name='tr_message_edit_history')
+    op.drop_table('tr_message_edit_history')
+    op.drop_index('ix_tr_room_members_user', table_name='tr_room_members')
+    op.drop_index('ix_tr_room_members_room_user', table_name='tr_room_members')
+    op.drop_table('tr_room_members')
+    op.drop_index('ix_tr_room_files_uploader', table_name='tr_room_files')
+    op.drop_index('ix_tr_room_files_room_uploaded', table_name='tr_room_files')
+    op.drop_table('tr_room_files')
+    op.drop_index('ix_tr_messages_sender', table_name='tr_messages')
+    op.drop_index('ix_tr_messages_room_sequence', table_name='tr_messages')
+    op.drop_index('ix_tr_messages_room_created', table_name='tr_messages')
+    op.drop_table('tr_messages')
+    op.drop_index('ix_tr_generated_reports_status', table_name='tr_generated_reports')
+    op.drop_index('ix_tr_generated_reports_room_date', table_name='tr_generated_reports')
+    op.drop_table('tr_generated_reports')
+    op.drop_index('ix_tr_users_display_name', table_name='tr_users')
+    op.drop_table('tr_users')
+    op.drop_index(op.f('ix_tr_user_sessions_internal_token'), table_name='tr_user_sessions')
+    op.drop_index(op.f('ix_tr_user_sessions_id'), table_name='tr_user_sessions')
+    op.drop_table('tr_user_sessions')
+    op.drop_table('tr_room_templates')
+    op.drop_index('ix_tr_incident_rooms_status_created', table_name='tr_incident_rooms')
+    op.drop_index('ix_tr_incident_rooms_created_by', table_name='tr_incident_rooms')
+    op.drop_table('tr_incident_rooms')
+    # ### end Alembic commands ###
diff --git a/alembic/versions/ea3798f776f4_change_ad_token_to_text_type.py b/alembic/versions/ea3798f776f4_change_ad_token_to_text_type.py
new file mode 100644
index 0000000..f7f48bb
--- /dev/null
+++ b/alembic/versions/ea3798f776f4_change_ad_token_to_text_type.py
@@ -0,0 +1,40 @@
+"""change ad_token to text type
+
+Revision ID: ea3798f776f4
+Revises: d80670b4abcb
+Create Date: 2025-12-07 14:13:47.469856
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import mysql
+
+# revision identifiers, used by Alembic.
+revision: str = 'ea3798f776f4'
+down_revision: Union[str, None] = 'd80670b4abcb'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('tr_user_sessions', 'ad_token',
+               existing_type=mysql.VARCHAR(length=500),
+               type_=sa.Text(),
+               comment='AD API token (JWT)',
+               existing_comment='AD API token',
+               existing_nullable=False)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('tr_user_sessions', 'ad_token',
+               existing_type=sa.Text(),
+               type_=mysql.VARCHAR(length=500),
+               comment='AD API token',
+               existing_comment='AD API token (JWT)',
+               existing_nullable=False)
+    # ### end Alembic commands ###
diff --git a/app/core/config.py b/app/core/config.py
index ccaa460..15e5d80 100644
--- a/app/core/config.py
+++ b/app/core/config.py
@@ -1,6 +1,9 @@
 """Application configuration loaded from environment variables"""
 from pydantic_settings import BaseSettings
+from pydantic import field_validator
 from functools import lru_cache
+from typing import List
+import logging
 
 
 class Settings(BaseSettings):
@@ -14,6 +17,7 @@ class Settings(BaseSettings):
 
     # AD API
     AD_API_URL: str
+    AD_API_TIMEOUT_SECONDS: int = 10  # AD API request timeout
 
     # Session Settings
     SESSION_INACTIVITY_DAYS: int = 3
@@ -23,7 +27,23 @@ class Settings(BaseSettings):
     # Server
     HOST: str = "0.0.0.0"
     PORT: int = 8000
-    DEBUG: bool = True
+    DEBUG: bool = False  # Default to False for security
+    LOG_LEVEL: str = "INFO"  # DEBUG, INFO, WARNING, ERROR
+
+    # CORS Configuration
+    CORS_ORIGINS: str = "http://localhost:3000"  # Comma-separated list of allowed origins
+
+    # System Admin
+    SYSTEM_ADMIN_EMAIL: str = ""  # System administrator email with special permissions
+
+    # Realtime Messaging Settings
+    MESSAGE_EDIT_TIME_LIMIT_MINUTES: int = 15  # Time limit for editing messages
+    TYPING_TIMEOUT_SECONDS: int = 3  # Typing indicator timeout
+
+    # File Upload Size Limits (in MB)
+    IMAGE_MAX_SIZE_MB: int = 10
+    DOCUMENT_MAX_SIZE_MB: int = 20
+    LOG_MAX_SIZE_MB: int = 5
 
     # MinIO Object Storage
     MINIO_ENDPOINT: str = "localhost:9000"
@@ -41,6 +61,41 @@ class Settings(BaseSettings):
     REPORT_MAX_MESSAGES: int = 200  # Summarize if exceeded
     REPORT_STORAGE_PATH: str = "reports"  # MinIO path prefix for reports
 
+    @field_validator("LOG_LEVEL")
+    @classmethod
+    def validate_log_level(cls, v: str) -> str:
+        """Validate log level"""
+        valid_levels = ["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"]
+        v_upper = v.upper()
+        if v_upper not in valid_levels:
+            raise ValueError(f"LOG_LEVEL must be one of {valid_levels}")
+        return v_upper
+
+    def get_cors_origins(self) -> List[str]:
+        """Parse CORS_ORIGINS into a list"""
+        if not self.CORS_ORIGINS:
+            return []
+        return [origin.strip() for origin in self.CORS_ORIGINS.split(",") if origin.strip()]
+
+    def get_image_max_size_bytes(self) -> int:
+        """Get image max size in bytes"""
+        return self.IMAGE_MAX_SIZE_MB * 1024 * 1024
+
+    def get_document_max_size_bytes(self) -> int:
+        """Get document max size in bytes"""
+        return self.DOCUMENT_MAX_SIZE_MB * 1024 * 1024
+
+    def get_log_max_size_bytes(self) -> int:
+        """Get log file max size in bytes"""
+        return self.LOG_MAX_SIZE_MB * 1024 * 1024
+
+    def configure_logging(self) -> None:
+        """Configure application logging based on LOG_LEVEL"""
+        logging.basicConfig(
+            level=getattr(logging, self.LOG_LEVEL),
+            format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
+        )
+
     class Config:
         env_file = ".env"
         case_sensitive = True
diff --git a/app/core/database.py b/app/core/database.py
index e4b0876..9eb7b51 100644
--- a/app/core/database.py
+++ b/app/core/database.py
@@ -1,4 +1,8 @@
-"""Database connection and session management"""
+"""Database connection and session management
+
+Supports MySQL database with connection pooling.
+All tables use 'tr_' prefix to avoid conflicts in shared database.
+"""
 from sqlalchemy import create_engine
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.orm import sessionmaker
@@ -6,10 +10,13 @@ from app.core.config import get_settings
 
 settings = get_settings()
 
-# Create engine
+# Create engine with MySQL connection pooling
 engine = create_engine(
     settings.DATABASE_URL,
-    connect_args={"check_same_thread": False} if "sqlite" in settings.DATABASE_URL else {},
+    pool_size=5,
+    max_overflow=10,
+    pool_pre_ping=True,  # Verify connection before using
+    pool_recycle=3600,  # Recycle connections after 1 hour
     echo=settings.DEBUG,
 )
 
diff --git a/app/main.py b/app/main.py
index 3f8bff2..3a1e55b 100644
--- a/app/main.py
+++ b/app/main.py
@@ -9,7 +9,6 @@ from fastapi.middleware.cors import CORSMiddleware
 from fastapi.staticfiles import StaticFiles
 from fastapi.responses import FileResponse
 from app.core.config import get_settings
-from app.core.database import engine, Base
 from app.modules.auth import router as auth_router
 from app.modules.auth.users_router import router as users_router
 from app.modules.auth.middleware import auth_middleware
@@ -24,8 +23,8 @@ FRONTEND_DIR = Path(__file__).parent.parent / "frontend" / "dist"
 
 settings = get_settings()
 
-# Create database tables
-Base.metadata.create_all(bind=engine)
+# Database tables are managed by Alembic migrations
+# Run: alembic upgrade head
 
 # Initialize FastAPI app
 app = FastAPI(
@@ -35,10 +34,10 @@ app = FastAPI(
     debug=settings.DEBUG,
 )
 
-# CORS middleware (adjust for production)
+# CORS middleware - origins configured via CORS_ORIGINS environment variable
 app.add_middleware(
     CORSMiddleware,
-    allow_origins=["*"],  # TODO: Restrict in production
+    allow_origins=settings.get_cors_origins(),
     allow_credentials=True,
     allow_methods=["*"],
     allow_headers=["*"],
diff --git a/app/modules/auth/models.py b/app/modules/auth/models.py
index fd3d486..cb52dce 100644
--- a/app/modules/auth/models.py
+++ b/app/modules/auth/models.py
@@ -1,10 +1,12 @@
 """SQLAlchemy models for authentication
 
 資料表結構：
-- user_sessions: 儲存使用者 session 資料，包含加密密碼用於自動刷新
-- users: 永久儲存使用者資訊 (用於報告生成時的姓名解析)
+- tr_user_sessions: 儲存使用者 session 資料，包含加密密碼用於自動刷新
+- tr_users: 永久儲存使用者資訊 (用於報告生成時的姓名解析)
+
+Note: All tables use 'tr_' prefix to avoid conflicts in shared database.
 """
-from sqlalchemy import Column, Integer, String, DateTime, Index
+from sqlalchemy import Column, Integer, String, DateTime, Index, Text
 from datetime import datetime
 from app.core.database import Base
 
@@ -12,7 +14,7 @@ from app.core.database import Base
 class UserSession(Base):
     """User session model with encrypted password for auto-refresh"""
 
-    __tablename__ = "user_sessions"
+    __tablename__ = "tr_user_sessions"
 
     id = Column(Integer, primary_key=True, index=True)
     username = Column(String(255), nullable=False, comment="User email from AD")
@@ -20,7 +22,7 @@ class UserSession(Base):
     internal_token = Column(
         String(255), unique=True, nullable=False, index=True, comment="Internal session token (UUID)"
     )
-    ad_token = Column(String(500), nullable=False, comment="AD API token")
+    ad_token = Column(Text, nullable=False, comment="AD API token (JWT)")
     encrypted_password = Column(String(500), nullable=False, comment="AES-256 encrypted password")
     ad_token_expires_at = Column(DateTime, nullable=False, comment="AD token expiry time")
     refresh_attempt_count = Column(
@@ -41,7 +43,7 @@ class User(Base):
     - Tracking user metadata (office location, job title)
     """
 
-    __tablename__ = "users"
+    __tablename__ = "tr_users"
 
     user_id = Column(
         String(255), primary_key=True, comment="User email address (e.g., ymirliu@panjit.com.tw)"
@@ -64,5 +66,5 @@ class User(Base):
 
     # Indexes
     __table_args__ = (
-        Index("ix_users_display_name", "display_name"),
+        Index("ix_tr_users_display_name", "display_name"),
     )
diff --git a/app/modules/auth/services/ad_client.py b/app/modules/auth/services/ad_client.py
index 77640c3..323ced4 100644
--- a/app/modules/auth/services/ad_client.py
+++ b/app/modules/auth/services/ad_client.py
@@ -18,7 +18,7 @@ class ADAuthService:
 
     def __init__(self):
         self.ad_api_url = settings.AD_API_URL
-        self._client = httpx.AsyncClient(timeout=10.0)
+        self._client = httpx.AsyncClient(timeout=float(settings.AD_API_TIMEOUT_SECONDS))
 
     async def authenticate(self, username: str, password: str) -> Dict[str, any]:
         """Authenticate user with AD API
diff --git a/app/modules/chat_room/models.py b/app/modules/chat_room/models.py
index 63d2c54..2d07306 100644
--- a/app/modules/chat_room/models.py
+++ b/app/modules/chat_room/models.py
@@ -1,9 +1,11 @@
 """SQLAlchemy models for chat room management
 
 Tables:
-- incident_rooms: Stores room metadata and configuration
-- room_members: User-room associations with roles
-- room_templates: Predefined templates for common incident types
+- tr_incident_rooms: Stores room metadata and configuration
+- tr_room_members: User-room associations with roles
+- tr_room_templates: Predefined templates for common incident types
+
+Note: All tables use 'tr_' prefix to avoid conflicts in shared database.
 """
 from sqlalchemy import Column, Integer, String, Text, DateTime, Enum, ForeignKey, UniqueConstraint, Index
 from sqlalchemy.orm import relationship
@@ -46,7 +48,7 @@ class MemberRole(str, enum.Enum):
 class IncidentRoom(Base):
     """Incident room model for production incidents"""
 
-    __tablename__ = "incident_rooms"
+    __tablename__ = "tr_incident_rooms"
 
     room_id = Column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
     title = Column(String(255), nullable=False)
@@ -80,18 +82,18 @@ class IncidentRoom(Base):
 
     # Indexes for common queries
     __table_args__ = (
-        Index("ix_incident_rooms_status_created", "status", "created_at"),
-        Index("ix_incident_rooms_created_by", "created_by"),
+        Index("ix_tr_incident_rooms_status_created", "status", "created_at"),
+        Index("ix_tr_incident_rooms_created_by", "created_by"),
     )
 
 
 class RoomMember(Base):
     """Room membership model"""
 
-    __tablename__ = "room_members"
+    __tablename__ = "tr_room_members"
 
     id = Column(Integer, primary_key=True, autoincrement=True)
-    room_id = Column(String(36), ForeignKey("incident_rooms.room_id", ondelete="CASCADE"), nullable=False)
+    room_id = Column(String(36), ForeignKey("tr_incident_rooms.room_id", ondelete="CASCADE"), nullable=False)
     user_id = Column(String(255), nullable=False)  # User email/ID
     role = Column(Enum(MemberRole), nullable=False)
 
@@ -106,16 +108,16 @@ class RoomMember(Base):
     # Constraints and indexes
     __table_args__ = (
         # Ensure unique active membership (where removed_at IS NULL)
-        UniqueConstraint("room_id", "user_id", "removed_at", name="uq_room_member_active"),
-        Index("ix_room_members_room_user", "room_id", "user_id"),
-        Index("ix_room_members_user", "user_id"),
+        UniqueConstraint("room_id", "user_id", "removed_at", name="uq_tr_room_member_active"),
+        Index("ix_tr_room_members_room_user", "room_id", "user_id"),
+        Index("ix_tr_room_members_user", "user_id"),
     )
 
 
 class RoomTemplate(Base):
     """Predefined templates for common incident types"""
 
-    __tablename__ = "room_templates"
+    __tablename__ = "tr_room_templates"
 
     template_id = Column(Integer, primary_key=True, autoincrement=True)
     name = Column(String(100), unique=True, nullable=False)
diff --git a/app/modules/file_storage/models.py b/app/modules/file_storage/models.py
index d67aa70..94f8571 100644
--- a/app/modules/file_storage/models.py
+++ b/app/modules/file_storage/models.py
@@ -8,13 +8,13 @@ from app.core.database import Base
 class RoomFile(Base):
     """File uploaded to an incident room"""
 
-    __tablename__ = "room_files"
+    __tablename__ = "tr_room_files"
 
     # Primary key
     file_id = Column(String(36), primary_key=True)
 
     # Foreign key to incident room (CASCADE delete when room is permanently deleted)
-    room_id = Column(String(36), ForeignKey("incident_rooms.room_id", ondelete="CASCADE"), nullable=False)
+    room_id = Column(String(36), ForeignKey("tr_incident_rooms.room_id", ondelete="CASCADE"), nullable=False)
 
     # File metadata
     uploader_id = Column(String(255), nullable=False)
@@ -36,8 +36,8 @@ class RoomFile(Base):
 
     # Indexes
     __table_args__ = (
-        Index("ix_room_files", "room_id", "uploaded_at"),
-        Index("ix_file_uploader", "uploader_id"),
+        Index("ix_tr_room_files_room_uploaded", "room_id", "uploaded_at"),
+        Index("ix_tr_room_files_uploader", "uploader_id"),
     )
 
     def __repr__(self):
diff --git a/app/modules/file_storage/validators.py b/app/modules/file_storage/validators.py
index ba71da5..02f84ce 100644
--- a/app/modules/file_storage/validators.py
+++ b/app/modules/file_storage/validators.py
@@ -4,7 +4,10 @@ from fastapi import UploadFile, HTTPException
 from typing import Set
 import logging
 
+from app.core.config import get_settings
+
 logger = logging.getLogger(__name__)
+settings = get_settings()
 
 # MIME type whitelists
 IMAGE_TYPES: Set[str] = {
@@ -22,11 +25,6 @@ LOG_TYPES: Set[str] = {
     "text/csv"
 }
 
-# File size limits (bytes)
-IMAGE_MAX_SIZE = 10 * 1024 * 1024  # 10MB
-DOCUMENT_MAX_SIZE = 20 * 1024 * 1024  # 20MB
-LOG_MAX_SIZE = 5 * 1024 * 1024  # 5MB
-
 
 def detect_mime_type(file_data: bytes) -> str:
     """
@@ -118,11 +116,11 @@ def get_file_type_and_limits(mime_type: str) -> tuple[str, int]:
         HTTPException if MIME type not recognized
     """
     if mime_type in IMAGE_TYPES:
-        return ("image", IMAGE_MAX_SIZE)
+        return ("image", settings.get_image_max_size_bytes())
     elif mime_type in DOCUMENT_TYPES:
-        return ("document", DOCUMENT_MAX_SIZE)
+        return ("document", settings.get_document_max_size_bytes())
     elif mime_type in LOG_TYPES:
-        return ("log", LOG_MAX_SIZE)
+        return ("log", settings.get_log_max_size_bytes())
     else:
         raise HTTPException(
             status_code=400,
diff --git a/app/modules/realtime/models.py b/app/modules/realtime/models.py
index 0fd5d7c..d7a2321 100644
--- a/app/modules/realtime/models.py
+++ b/app/modules/realtime/models.py
@@ -1,9 +1,11 @@
 """SQLAlchemy models for realtime messaging
 
 Tables:
-- messages: Stores all messages sent in incident rooms
-- message_reactions: User reactions to messages (emoji)
-- message_edit_history: Audit trail for message edits
+- tr_messages: Stores all messages sent in incident rooms
+- tr_message_reactions: User reactions to messages (emoji)
+- tr_message_edit_history: Audit trail for message edits
+
+Note: All tables use 'tr_' prefix to avoid conflicts in shared database.
 """
 from sqlalchemy import Column, Integer, String, Text, DateTime, Enum, ForeignKey, UniqueConstraint, Index, BigInteger, JSON
 from sqlalchemy.orm import relationship
@@ -25,10 +27,10 @@ class MessageType(str, enum.Enum):
 class Message(Base):
     """Message model for incident room communications"""
 
-    __tablename__ = "messages"
+    __tablename__ = "tr_messages"
 
     message_id = Column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
-    room_id = Column(String(36), ForeignKey("incident_rooms.room_id", ondelete="CASCADE"), nullable=False)
+    room_id = Column(String(36), ForeignKey("tr_incident_rooms.room_id", ondelete="CASCADE"), nullable=False)
     sender_id = Column(String(255), nullable=False)  # User email/ID
     content = Column(Text, nullable=False)
     message_type = Column(Enum(MessageType), default=MessageType.TEXT, nullable=False)
@@ -42,7 +44,6 @@ class Message(Base):
     deleted_at = Column(DateTime)  # Soft delete timestamp
 
     # Sequence number for FIFO ordering within a room
-    # Note: Autoincrement doesn't work for non-PK in SQLite, will be set in service layer
     sequence_number = Column(BigInteger, nullable=False)
 
     # Relationships
@@ -51,22 +52,19 @@ class Message(Base):
 
     # Indexes for common queries
     __table_args__ = (
-        Index("ix_messages_room_created", "room_id", "created_at"),
-        Index("ix_messages_room_sequence", "room_id", "sequence_number"),
-        Index("ix_messages_sender", "sender_id"),
-        # PostgreSQL full-text search index on content (commented for SQLite compatibility)
-        # Note: Uncomment when using PostgreSQL with pg_trgm extension enabled
-        # Index("ix_messages_content_search", "content", postgresql_using='gin', postgresql_ops={'content': 'gin_trgm_ops'}),
+        Index("ix_tr_messages_room_created", "room_id", "created_at"),
+        Index("ix_tr_messages_room_sequence", "room_id", "sequence_number"),
+        Index("ix_tr_messages_sender", "sender_id"),
     )
 
 
 class MessageReaction(Base):
     """Message reaction model for emoji reactions"""
 
-    __tablename__ = "message_reactions"
+    __tablename__ = "tr_message_reactions"
 
     reaction_id = Column(Integer, primary_key=True, autoincrement=True)
-    message_id = Column(String(36), ForeignKey("messages.message_id", ondelete="CASCADE"), nullable=False)
+    message_id = Column(String(36), ForeignKey("tr_messages.message_id", ondelete="CASCADE"), nullable=False)
     user_id = Column(String(255), nullable=False)  # User email/ID who reacted
     emoji = Column(String(10), nullable=False)  # Emoji character or code
 
@@ -79,18 +77,18 @@ class MessageReaction(Base):
     # Constraints and indexes
     __table_args__ = (
         # Ensure unique reaction per user per message
-        UniqueConstraint("message_id", "user_id", "emoji", name="uq_message_reaction"),
-        Index("ix_message_reactions_message", "message_id"),
+        UniqueConstraint("message_id", "user_id", "emoji", name="uq_tr_message_reaction"),
+        Index("ix_tr_message_reactions_message", "message_id"),
     )
 
 
 class MessageEditHistory(Base):
     """Message edit history model for audit trail"""
 
-    __tablename__ = "message_edit_history"
+    __tablename__ = "tr_message_edit_history"
 
     edit_id = Column(Integer, primary_key=True, autoincrement=True)
-    message_id = Column(String(36), ForeignKey("messages.message_id", ondelete="CASCADE"), nullable=False)
+    message_id = Column(String(36), ForeignKey("tr_messages.message_id", ondelete="CASCADE"), nullable=False)
     original_content = Column(Text, nullable=False)  # Content before edit
     edited_by = Column(String(255), nullable=False)  # User who made the edit
 
@@ -102,5 +100,5 @@ class MessageEditHistory(Base):
 
     # Indexes
     __table_args__ = (
-        Index("ix_message_edit_history_message", "message_id", "edited_at"),
+        Index("ix_tr_message_edit_history_message", "message_id", "edited_at"),
     )
diff --git a/app/modules/realtime/router.py b/app/modules/realtime/router.py
index 6a57c14..b678f80 100644
--- a/app/modules/realtime/router.py
+++ b/app/modules/realtime/router.py
@@ -7,6 +7,7 @@ from datetime import datetime
 import json
 
 from app.core.database import get_db
+from app.core.config import get_settings
 from app.modules.auth.dependencies import get_current_user
 from app.modules.auth.services.session_service import session_service
 from app.modules.chat_room.models import RoomMember, MemberRole
@@ -32,7 +33,7 @@ from sqlalchemy import and_
 
 router = APIRouter(prefix="/api", tags=["realtime"])
 
-SYSTEM_ADMIN_EMAIL = "ymirliu@panjit.com.tw"
+settings = get_settings()
 
 
 async def ws_send_json(websocket: WebSocket, data: dict):
@@ -51,9 +52,14 @@ def get_user_room_membership(db: Session, room_id: str, user_id: str) -> Optiona
     ).first()
 
 
+def is_system_admin(user_id: str) -> bool:
+    """Check if user is the system administrator"""
+    return bool(settings.SYSTEM_ADMIN_EMAIL and user_id == settings.SYSTEM_ADMIN_EMAIL)
+
+
 def can_write_message(membership: Optional[RoomMember], user_id: str) -> bool:
     """Check if user has write permission (OWNER or EDITOR)"""
-    if user_id == SYSTEM_ADMIN_EMAIL:
+    if is_system_admin(user_id):
         return True
 
     if not membership:
@@ -99,7 +105,7 @@ async def websocket_endpoint(
 
         # Check room membership
         membership = get_user_room_membership(db, room_id, user_id)
-        if not membership and user_id != SYSTEM_ADMIN_EMAIL:
+        if not membership and not is_system_admin(user_id):
             await websocket.close(code=4001, reason="Not a member of this room")
             return
 
@@ -225,12 +231,11 @@ async def websocket_endpoint(
                         continue
 
                     # Delete message
-                    is_admin = user_id == SYSTEM_ADMIN_EMAIL
                     deleted_message = MessageService.delete_message(
                         db=db,
                         message_id=ws_message.message_id,
                         user_id=user_id,
-                        is_admin=is_admin
+                        is_admin=is_system_admin(user_id)
                     )
 
                     if not deleted_message:
@@ -345,7 +350,7 @@ async def get_messages(
 
     # Check room membership
     membership = get_user_room_membership(db, room_id, user_id)
-    if not membership and user_id != SYSTEM_ADMIN_EMAIL:
+    if not membership and not is_system_admin(user_id):
         raise HTTPException(status_code=403, detail="Not a member of this room")
 
     return MessageService.get_messages(
@@ -414,7 +419,7 @@ async def search_messages(
 
     # Check room membership
     membership = get_user_room_membership(db, room_id, user_id)
-    if not membership and user_id != SYSTEM_ADMIN_EMAIL:
+    if not membership and not is_system_admin(user_id):
         raise HTTPException(status_code=403, detail="Not a member of this room")
 
     return MessageService.search_messages(
@@ -437,7 +442,7 @@ async def get_online_users(
 
     # Check room membership
     membership = get_user_room_membership(db, room_id, user_id)
-    if not membership and user_id != SYSTEM_ADMIN_EMAIL:
+    if not membership and not is_system_admin(user_id):
         raise HTTPException(status_code=403, detail="Not a member of this room")
 
     online_users = manager.get_online_users(room_id)
@@ -455,7 +460,7 @@ async def get_typing_users(
 
     # Check room membership
     membership = get_user_room_membership(db, room_id, user_id)
-    if not membership and user_id != SYSTEM_ADMIN_EMAIL:
+    if not membership and not is_system_admin(user_id):
         raise HTTPException(status_code=403, detail="Not a member of this room")
 
     typing_users = manager.get_typing_users(room_id)
diff --git a/app/modules/realtime/services/message_service.py b/app/modules/realtime/services/message_service.py
index 55673c4..ba8930e 100644
--- a/app/modules/realtime/services/message_service.py
+++ b/app/modules/realtime/services/message_service.py
@@ -5,6 +5,7 @@ from typing import List, Optional, Dict, Any
 from datetime import datetime, timedelta
 import uuid
 
+from app.core.config import get_settings
 from app.modules.realtime.models import Message, MessageType, MessageReaction, MessageEditHistory
 from app.modules.realtime.schemas import (
     MessageCreate,
@@ -13,6 +14,8 @@ from app.modules.realtime.schemas import (
     ReactionSummary
 )
 
+settings = get_settings()
+
 
 class MessageService:
     """Service for message operations"""
@@ -161,9 +164,9 @@ class MessageService:
         if message.sender_id != user_id:
             return None
 
-        # Check time limit (15 minutes)
+        # Check time limit (configurable via MESSAGE_EDIT_TIME_LIMIT_MINUTES)
         time_diff = datetime.utcnow() - message.created_at
-        if time_diff > timedelta(minutes=15):
+        if time_diff > timedelta(minutes=settings.MESSAGE_EDIT_TIME_LIMIT_MINUTES):
             return None
 
         # Store original content in edit history
diff --git a/app/modules/realtime/websocket_manager.py b/app/modules/realtime/websocket_manager.py
index 6f94825..1d66ccb 100644
--- a/app/modules/realtime/websocket_manager.py
+++ b/app/modules/realtime/websocket_manager.py
@@ -6,6 +6,10 @@ import asyncio
 import json
 from collections import defaultdict
 
+from app.core.config import get_settings
+
+settings = get_settings()
+
 
 def json_serializer(obj: Any) -> str:
     """Custom JSON serializer for objects not serializable by default json code"""
@@ -193,9 +197,11 @@ class WebSocketManager:
             if user_id in self._typing_tasks:
                 self._typing_tasks[user_id].cancel()
 
-            # Set new timeout (3 seconds)
+            # Set new timeout (configurable via TYPING_TIMEOUT_SECONDS)
+            typing_timeout = settings.TYPING_TIMEOUT_SECONDS
+
             async def clear_typing():
-                await asyncio.sleep(3)
+                await asyncio.sleep(typing_timeout)
                 self._typing_users[room_id].discard(user_id)
                 if user_id in self._typing_tasks:
                     del self._typing_tasks[user_id]
diff --git a/app/modules/report_generation/models.py b/app/modules/report_generation/models.py
index 03a0ce4..6b66fda 100644
--- a/app/modules/report_generation/models.py
+++ b/app/modules/report_generation/models.py
@@ -1,7 +1,9 @@
 """SQLAlchemy models for report generation
 
 Tables:
-- generated_reports: Stores report metadata and generation status
+- tr_generated_reports: Stores report metadata and generation status
+
+Note: All tables use 'tr_' prefix to avoid conflicts in shared database.
 """
 from sqlalchemy import Column, String, Text, DateTime, Integer, ForeignKey, Index, JSON
 from sqlalchemy.orm import relationship
@@ -24,14 +26,14 @@ class ReportStatus(str, enum.Enum):
 class GeneratedReport(Base):
     """Generated report model for incident reports"""
 
-    __tablename__ = "generated_reports"
+    __tablename__ = "tr_generated_reports"
 
     report_id = Column(
         String(36), primary_key=True, default=lambda: str(uuid.uuid4()),
         comment="Unique report identifier (UUID)"
     )
     room_id = Column(
-        String(36), ForeignKey("incident_rooms.room_id", ondelete="CASCADE"),
+        String(36), ForeignKey("tr_incident_rooms.room_id", ondelete="CASCADE"),
         nullable=False, comment="Reference to incident room"
     )
 
@@ -92,8 +94,8 @@ class GeneratedReport(Base):
 
     # Indexes
     __table_args__ = (
-        Index("ix_generated_reports_room_date", "room_id", "generated_at"),
-        Index("ix_generated_reports_status", "status"),
+        Index("ix_tr_generated_reports_room_date", "room_id", "generated_at"),
+        Index("ix_tr_generated_reports_status", "status"),
     )
 
     def __repr__(self):
diff --git a/docker-compose.minio.yml b/docker-compose.minio.yml
index 99f50a4..a142a27 100644
--- a/docker-compose.minio.yml
+++ b/docker-compose.minio.yml
@@ -1,9 +1,10 @@
 # MinIO Object Storage for Task Reporter
 # Usage: docker-compose -f docker-compose.minio.yml up -d
+#        docker-compose -f docker-compose.minio.yml --env-file .env.docker up -d
 #
 # This configuration starts MinIO for local development.
-# Access MinIO Console at: http://localhost:9001
-# S3 API endpoint at: http://localhost:9000
+# Access MinIO Console at: http://localhost:${MINIO_CONSOLE_PORT:-9001}
+# S3 API endpoint at: http://localhost:${MINIO_API_PORT:-9000}
 
 version: '3.8'
 
@@ -12,11 +13,11 @@ services:
     image: minio/minio:latest
     container_name: task-reporter-minio
     ports:
-      - "9000:9000"   # S3 API
-      - "9001:9001"   # MinIO Console
+      - "${MINIO_API_PORT:-9000}:9000"      # S3 API
+      - "${MINIO_CONSOLE_PORT:-9001}:9001"  # MinIO Console
     environment:
-      MINIO_ROOT_USER: minioadmin
-      MINIO_ROOT_PASSWORD: minioadmin
+      MINIO_ROOT_USER: ${MINIO_ROOT_USER:-minioadmin}
+      MINIO_ROOT_PASSWORD: ${MINIO_ROOT_PASSWORD:-minioadmin}
     command: server /data --console-address ":9001"
     volumes:
       - minio_data:/data
@@ -35,28 +36,40 @@ volumes:
 # Quick Start Guide
 # ============================================================================
 #
-# 1. Start MinIO:
+# 1. Start MinIO (with default settings):
 #    docker-compose -f docker-compose.minio.yml up -d
 #
-# 2. Access MinIO Console:
-#    Open http://localhost:9001 in your browser
-#    Login: minioadmin / minioadmin
+# 2. Start MinIO (with custom settings from .env.docker):
+#    docker-compose -f docker-compose.minio.yml --env-file .env.docker up -d
 #
-# 3. The application will automatically create the bucket on startup
+# 3. Access MinIO Console:
+#    Open http://localhost:9001 in your browser
+#    Login with MINIO_ROOT_USER / MINIO_ROOT_PASSWORD
+#
+# 4. The application will automatically create the bucket on startup
 #    (configured as 'task-reporter-files' in .env)
 #
-# 4. Stop MinIO:
+# 5. Stop MinIO:
 #    docker-compose -f docker-compose.minio.yml down
 #
-# 5. Remove all data:
+# 6. Remove all data:
 #    docker-compose -f docker-compose.minio.yml down -v
 #
 # ============================================================================
+# Environment Variables
+# ============================================================================
+#
+# MINIO_ROOT_USER     - MinIO admin username (default: minioadmin)
+# MINIO_ROOT_PASSWORD - MinIO admin password (default: minioadmin)
+# MINIO_API_PORT      - S3 API port (default: 9000)
+# MINIO_CONSOLE_PORT  - Web console port (default: 9001)
+#
+# ============================================================================
 # Production Notes
 # ============================================================================
 #
 # For production deployment:
-# - Change MINIO_ROOT_USER and MINIO_ROOT_PASSWORD to secure values
+# - Set secure MINIO_ROOT_USER and MINIO_ROOT_PASSWORD in .env.docker
 # - Use external volume or persistent storage
 # - Configure TLS/HTTPS
 # - Set up proper backup policies
diff --git a/frontend/.env.example b/frontend/.env.example
index 64f120c..a0a0ca4 100644
--- a/frontend/.env.example
+++ b/frontend/.env.example
@@ -1,11 +1,56 @@
-# Frontend Environment Variables
+# =============================================================================
+# Task Reporter - Frontend Environment Configuration
+# =============================================================================
+# Copy this file to .env and customize as needed.
+# All variables are optional and have sensible defaults for development.
+# =============================================================================
 
+# -----------------------------------------------------------------------------
+# API Configuration
+# -----------------------------------------------------------------------------
 # API Base URL (optional)
-# - For local development: leave empty or don't set (will use /api)
+# - For local development: leave empty or don't set (will use /api with proxy)
 # - For production with separate backend: set to full URL
 # Example: https://api.yourdomain.com/api
 VITE_API_BASE_URL=
 
-# Note: When set, this URL is also used for WebSocket connections
-# http:// will be converted to ws://
-# https:// will be converted to wss://
+# API request timeout in milliseconds (default: 30000 = 30 seconds)
+VITE_API_TIMEOUT_MS=30000
+
+# -----------------------------------------------------------------------------
+# Development Server Configuration
+# -----------------------------------------------------------------------------
+# Frontend development server port (default: 3000)
+VITE_PORT=3000
+
+# Backend API URL for development proxy (default: http://localhost:8000)
+# This is used by Vite's proxy configuration during development
+VITE_BACKEND_URL=http://localhost:8000
+
+# -----------------------------------------------------------------------------
+# WebSocket Configuration
+# -----------------------------------------------------------------------------
+# Maximum WebSocket reconnection delay in milliseconds (default: 30000 = 30 seconds)
+# The reconnection uses exponential backoff, capped at this value
+VITE_MAX_RECONNECT_DELAY_MS=30000
+
+# -----------------------------------------------------------------------------
+# Query/Cache Configuration
+# -----------------------------------------------------------------------------
+# Messages refetch interval in milliseconds (default: 30000 = 30 seconds)
+# Used for polling online users status
+VITE_MESSAGES_REFETCH_INTERVAL_MS=30000
+
+# Reports stale time in milliseconds (default: 30000 = 30 seconds)
+# Time before cached report data is considered stale
+VITE_REPORTS_STALE_TIME_MS=30000
+
+# =============================================================================
+# Notes
+# =============================================================================
+# - All VITE_ prefixed variables are exposed to the browser
+# - Never put sensitive data (API keys, secrets) in frontend environment variables
+# - When VITE_API_BASE_URL is set:
+#   - http:// URLs will be converted to ws:// for WebSocket connections
+#   - https:// URLs will be converted to wss:// for WebSocket connections
+# =============================================================================
diff --git a/frontend/src/hooks/useMessages.ts b/frontend/src/hooks/useMessages.ts
index 8401b64..bfcd291 100644
--- a/frontend/src/hooks/useMessages.ts
+++ b/frontend/src/hooks/useMessages.ts
@@ -61,12 +61,18 @@ export function useCreateMessage(roomId: string) {
   })
 }
 
+// Configurable refetch interval for online users (default 30 seconds)
+const MESSAGES_REFETCH_INTERVAL = parseInt(
+  import.meta.env.VITE_MESSAGES_REFETCH_INTERVAL_MS || '30000',
+  10
+)
+
 export function useOnlineUsers(roomId: string) {
   return useQuery({
     queryKey: messageKeys.online(roomId),
     queryFn: () => messagesService.getOnlineUsers(roomId),
     enabled: !!roomId,
-    refetchInterval: 30000, // Refresh every 30 seconds
+    refetchInterval: MESSAGES_REFETCH_INTERVAL,
   })
 }
 
diff --git a/frontend/src/hooks/useReports.ts b/frontend/src/hooks/useReports.ts
index e6aab6d..06d9365 100644
--- a/frontend/src/hooks/useReports.ts
+++ b/frontend/src/hooks/useReports.ts
@@ -14,6 +14,12 @@ const reportKeys = {
     [...reportKeys.all, 'detail', roomId, reportId] as const,
 }
 
+// Configurable stale time for reports (default 30 seconds)
+const REPORTS_STALE_TIME = parseInt(
+  import.meta.env.VITE_REPORTS_STALE_TIME_MS || '30000',
+  10
+)
+
 /**
  * Hook to list reports for a room
  */
@@ -22,7 +28,7 @@ export function useReports(roomId: string) {
     queryKey: reportKeys.list(roomId),
     queryFn: () => reportsService.listReports(roomId),
     enabled: !!roomId,
-    staleTime: 30000, // 30 seconds
+    staleTime: REPORTS_STALE_TIME,
   })
 }
 
diff --git a/frontend/src/hooks/useWebSocket.ts b/frontend/src/hooks/useWebSocket.ts
index 509d75e..834865b 100644
--- a/frontend/src/hooks/useWebSocket.ts
+++ b/frontend/src/hooks/useWebSocket.ts
@@ -12,7 +12,10 @@ import type {
 } from '../types'
 
 const RECONNECT_DELAY = 1000
-const MAX_RECONNECT_DELAY = 30000
+const MAX_RECONNECT_DELAY = parseInt(
+  import.meta.env.VITE_MAX_RECONNECT_DELAY_MS || '30000',
+  10
+)
 const RECONNECT_MULTIPLIER = 2
 
 interface UseWebSocketOptions {
diff --git a/frontend/src/services/api.ts b/frontend/src/services/api.ts
index c49c0da..9442d77 100644
--- a/frontend/src/services/api.ts
+++ b/frontend/src/services/api.ts
@@ -3,10 +3,13 @@ import axios, { type AxiosError, type InternalAxiosRequestConfig } from 'axios'
 // API Base URL: use environment variable or default to relative path
 const API_BASE_URL = import.meta.env.VITE_API_BASE_URL || '/api'
 
+// API Timeout: configurable via environment variable (default 30 seconds)
+const API_TIMEOUT = parseInt(import.meta.env.VITE_API_TIMEOUT_MS || '30000', 10)
+
 // Create axios instance
 const api = axios.create({
   baseURL: API_BASE_URL,
-  timeout: 30000,
+  timeout: API_TIMEOUT,
   headers: {
     'Content-Type': 'application/json',
   },
diff --git a/frontend/vite.config.ts b/frontend/vite.config.ts
index 0b548a0..4ab7e31 100644
--- a/frontend/vite.config.ts
+++ b/frontend/vite.config.ts
@@ -1,28 +1,36 @@
 /// <reference types="vitest/config" />
-import { defineConfig } from 'vite'
+import { defineConfig, loadEnv } from 'vite'
 import react from '@vitejs/plugin-react'
 import tailwindcss from '@tailwindcss/vite'
 
 // https://vite.dev/config/
-export default defineConfig({
-  plugins: [
-    tailwindcss(),
-    react(),
-  ],
-  server: {
-    port: 3000,
-    proxy: {
-      '/api': {
-        target: 'http://localhost:8000',
-        changeOrigin: true,
-        ws: true, // Enable WebSocket proxying
+export default defineConfig(({ mode }) => {
+  const env = loadEnv(mode, process.cwd(), '')
+
+  // Configuration from environment variables with defaults
+  const PORT = parseInt(env.VITE_PORT || '3000', 10)
+  const BACKEND_URL = env.VITE_BACKEND_URL || 'http://localhost:8000'
+
+  return {
+    plugins: [
+      tailwindcss(),
+      react(),
+    ],
+    server: {
+      port: PORT,
+      proxy: {
+        '/api': {
+          target: BACKEND_URL,
+          changeOrigin: true,
+          ws: true, // Enable WebSocket proxying
+        },
       },
     },
-  },
-  test: {
-    globals: true,
-    environment: 'jsdom',
-    setupFiles: ['./src/test/setup.ts'],
-    include: ['src/**/*.{test,spec}.{js,mjs,cjs,ts,mts,cts,jsx,tsx}'],
-  },
+    test: {
+      globals: true,
+      environment: 'jsdom',
+      setupFiles: ['./src/test/setup.ts'],
+      include: ['src/**/*.{test,spec}.{js,mjs,cjs,ts,mts,cts,jsx,tsx}'],
+    },
+  }
 })
diff --git a/openspec/changes/archive/2025-12-07-add-unified-env-config/proposal.md b/openspec/changes/archive/2025-12-07-add-unified-env-config/proposal.md
new file mode 100644
index 0000000..9c689d2
--- /dev/null
+++ b/openspec/changes/archive/2025-12-07-add-unified-env-config/proposal.md
@@ -0,0 +1,63 @@
+# Change: Unified Environment Configuration Management
+
+## Why
+
+目前專案中存在多處硬編碼的設定值（端口、URL、超時時間、檔案大小限制等），分散在後端 Python 程式碼、前端 TypeScript 程式碼、Docker 配置檔案及開發腳本中。這造成：
+
+1. **部署困難**：每次部署到不同環境需要修改多個檔案
+2. **安全風險**：CORS 使用萬用字元 `["*"]`、MinIO 使用預設密碼
+3. **維護成本**：設定值分散在 20+ 個檔案中，難以追蹤和更新
+4. **環境一致性問題**：開發、測試、生產環境難以保持設定同步
+
+## What Changes
+
+### Backend Configuration (Python)
+- 將所有硬編碼的設定值移至 `app/core/config.py` 的 Settings 類別
+- 擴展 `.env` 文件以包含所有可配置項目
+- 新增以下環境變數：
+  - `HOST`, `PORT`, `DEBUG` - 伺服器設定
+  - `CORS_ORIGINS` - CORS 來源白名單（**BREAKING**: 移除萬用字元）
+  - `SYSTEM_ADMIN_EMAIL` - 系統管理員信箱
+  - `AD_API_TIMEOUT_SECONDS` - AD API 超時設定
+  - `MESSAGE_EDIT_TIME_LIMIT_MINUTES` - 訊息編輯時間限制
+  - `TYPING_TIMEOUT_SECONDS` - 打字指示器超時
+  - `IMAGE_MAX_SIZE_MB`, `DOCUMENT_MAX_SIZE_MB`, `LOG_MAX_SIZE_MB` - 檔案大小限制
+  - `LOG_LEVEL` - 日誌等級
+
+### Frontend Configuration (TypeScript/Vite)
+- 使用 Vite 環境變數機制 (`import.meta.env`)
+- 新增以下環境變數：
+  - `VITE_API_TIMEOUT_MS` - API 請求超時
+  - `VITE_MESSAGES_REFETCH_INTERVAL_MS` - 訊息重新取得間隔
+  - `VITE_MAX_RECONNECT_DELAY_MS` - WebSocket 重連延遲
+  - `VITE_REPORTS_STALE_TIME_MS` - 報告快取過期時間
+  - `VITE_PORT` - 開發伺服器端口
+  - `VITE_BACKEND_URL` - 後端 API URL
+
+### Docker Configuration
+- 將 `docker-compose.minio.yml` 中的硬編碼認證資訊改為環境變數
+- 新增 `.env.docker` 範例檔案
+
+### Documentation
+- 更新 `.env.example` 包含所有環境變數及說明
+- 更新 `frontend/.env.example` 包含所有前端環境變數
+
+## Impact
+
+- **Affected specs**: 新增 `env-config` spec
+- **Affected code**:
+  - `app/core/config.py` - 擴展 Settings 類別
+  - `app/main.py` - CORS 設定改為從環境變數讀取
+  - `app/modules/realtime/router.py` - SYSTEM_ADMIN_EMAIL
+  - `app/modules/auth/services/ad_client.py` - AD API 超時
+  - `app/modules/realtime/services/message_service.py` - 訊息編輯限制
+  - `app/modules/realtime/websocket_manager.py` - 打字超時
+  - `app/modules/file_storage/validators.py` - 檔案大小限制
+  - `frontend/vite.config.ts` - 端口和後端 URL
+  - `frontend/src/services/api.ts` - API 超時
+  - `frontend/src/hooks/*.ts` - 各種超時和間隔設定
+  - `docker-compose.minio.yml` - MinIO 認證
+  - `.env.example`, `frontend/.env.example` - 文件更新
+- **Breaking changes**:
+  - CORS 設定從 `["*"]` 改為必須明確指定來源
+  - 新的必要環境變數可能導致現有部署需要更新 `.env` 檔案
diff --git a/openspec/changes/archive/2025-12-07-add-unified-env-config/specs/env-config/spec.md b/openspec/changes/archive/2025-12-07-add-unified-env-config/specs/env-config/spec.md
new file mode 100644
index 0000000..bf5e209
--- /dev/null
+++ b/openspec/changes/archive/2025-12-07-add-unified-env-config/specs/env-config/spec.md
@@ -0,0 +1,158 @@
+## ADDED Requirements
+
+### Requirement: Centralized Backend Configuration
+系統 SHALL 透過 `app/core/config.py` 中的 Settings 類別集中管理所有後端配置，並從環境變數讀取設定值。
+
+**必要環境變數：**
+| 變數名稱 | 類型 | 預設值 | 說明 |
+|---------|------|--------|------|
+| `DATABASE_URL` | str | (必填) | 資料庫連線字串 |
+| `FERNET_KEY` | str | (必填) | 加密金鑰 |
+| `AD_API_URL` | str | (必填) | AD 認證 API URL |
+| `HOST` | str | `0.0.0.0` | 伺服器綁定位址 |
+| `PORT` | int | `8000` | 伺服器端口 |
+| `DEBUG` | bool | `False` | 除錯模式 |
+| `LOG_LEVEL` | str | `INFO` | 日誌等級 (DEBUG/INFO/WARNING/ERROR) |
+| `CORS_ORIGINS` | str | (必填) | 允許的 CORS 來源，逗號分隔 |
+| `SYSTEM_ADMIN_EMAIL` | str | (必填) | 系統管理員信箱 |
+| `AD_API_TIMEOUT_SECONDS` | int | `10` | AD API 請求超時秒數 |
+| `SESSION_INACTIVITY_DAYS` | int | `3` | 會話閒置過期天數 |
+| `TOKEN_REFRESH_THRESHOLD_MINUTES` | int | `5` | Token 更新閾值分鐘數 |
+| `MAX_REFRESH_ATTEMPTS` | int | `3` | 最大 Token 更新嘗試次數 |
+| `MESSAGE_EDIT_TIME_LIMIT_MINUTES` | int | `15` | 訊息編輯時間限制分鐘數 |
+| `TYPING_TIMEOUT_SECONDS` | int | `3` | 打字指示器超時秒數 |
+
+#### Scenario: 必要環境變數缺失時啟動失敗
+- **WHEN** 啟動應用程式時缺少必要環境變數（如 `DATABASE_URL`）
+- **THEN** 應用程式 SHALL 顯示明確錯誤訊息並拒絕啟動
+
+#### Scenario: 使用預設值啟動
+- **WHEN** 提供所有必要環境變數但未設定選填變數
+- **THEN** 系統 SHALL 使用預設值正常啟動
+
+---
+
+### Requirement: File Storage Configuration
+系統 SHALL 支援透過環境變數配置檔案儲存相關設定。
+
+**環境變數：**
+| 變數名稱 | 類型 | 預設值 | 說明 |
+|---------|------|--------|------|
+| `MINIO_ENDPOINT` | str | `localhost:9000` | MinIO 伺服器位址 |
+| `MINIO_ACCESS_KEY` | str | `minioadmin` | MinIO 存取金鑰 |
+| `MINIO_SECRET_KEY` | str | `minioadmin` | MinIO 密鑰 |
+| `MINIO_BUCKET` | str | `task-reporter-files` | 預設儲存桶名稱 |
+| `MINIO_SECURE` | bool | `False` | 是否使用 HTTPS |
+| `IMAGE_MAX_SIZE_MB` | int | `10` | 圖片最大上傳大小 (MB) |
+| `DOCUMENT_MAX_SIZE_MB` | int | `20` | 文件最大上傳大小 (MB) |
+| `LOG_MAX_SIZE_MB` | int | `5` | 日誌檔最大上傳大小 (MB) |
+
+#### Scenario: 自訂檔案大小限制
+- **WHEN** 設定 `IMAGE_MAX_SIZE_MB=20`
+- **THEN** 系統 SHALL 接受最大 20MB 的圖片上傳
+
+#### Scenario: MinIO 連線配置
+- **WHEN** 設定自訂 MinIO 端點和認證資訊
+- **THEN** 系統 SHALL 使用該配置連線 MinIO 服務
+
+---
+
+### Requirement: AI Service Configuration
+系統 SHALL 支援透過環境變數配置 AI 報告生成服務。
+
+**環境變數：**
+| 變數名稱 | 類型 | 預設值 | 說明 |
+|---------|------|--------|------|
+| `DIFY_BASE_URL` | str | `https://dify.theaken.com/v1` | DIFY API 基礎 URL |
+| `DIFY_API_KEY` | str | `""` | DIFY API 金鑰 |
+| `DIFY_TIMEOUT_SECONDS` | int | `120` | DIFY API 請求超時秒數 |
+| `REPORT_MAX_MESSAGES` | int | `200` | 報告包含的最大訊息數 |
+| `REPORT_STORAGE_PATH` | str | `reports` | 報告儲存路徑 |
+
+#### Scenario: DIFY API 配置
+- **WHEN** 設定有效的 `DIFY_API_KEY`
+- **THEN** 系統 SHALL 能夠呼叫 DIFY API 生成報告
+
+#### Scenario: DIFY API 金鑰缺失
+- **WHEN** 未設定 `DIFY_API_KEY` 或設為空字串
+- **THEN** 報告生成功能 SHALL 返回適當錯誤訊息
+
+---
+
+### Requirement: Frontend Environment Configuration
+前端應用程式 SHALL 透過 Vite 環境變數機制配置運行時設定。
+
+**環境變數：**
+| 變數名稱 | 類型 | 預設值 | 說明 |
+|---------|------|--------|------|
+| `VITE_API_BASE_URL` | str | `""` | API 基礎 URL（空字串表示相對路徑） |
+| `VITE_PORT` | int | `3000` | 開發伺服器端口 |
+| `VITE_BACKEND_URL` | str | `http://localhost:8000` | 後端 API URL（開發代理用） |
+| `VITE_API_TIMEOUT_MS` | int | `30000` | API 請求超時毫秒數 |
+| `VITE_MESSAGES_REFETCH_INTERVAL_MS` | int | `30000` | 訊息重新取得間隔毫秒數 |
+| `VITE_MAX_RECONNECT_DELAY_MS` | int | `30000` | WebSocket 最大重連延遲毫秒數 |
+| `VITE_REPORTS_STALE_TIME_MS` | int | `30000` | 報告快取過期時間毫秒數 |
+
+#### Scenario: 開發環境配置
+- **WHEN** 在開發環境執行 `npm run dev`
+- **THEN** 前端 SHALL 使用 `VITE_BACKEND_URL` 設定代理轉發 API 請求
+
+#### Scenario: 生產環境配置
+- **WHEN** 建置生產版本並設定 `VITE_API_BASE_URL`
+- **THEN** 前端 SHALL 使用該 URL 作為 API 請求基礎路徑
+
+---
+
+### Requirement: Docker Environment Configuration
+Docker 部署 SHALL 支援透過環境變數文件配置所有服務。
+
+**Docker Compose 支援的環境變數：**
+| 變數名稱 | 類型 | 說明 |
+|---------|------|------|
+| `MINIO_ROOT_USER` | str | MinIO 管理員帳號 |
+| `MINIO_ROOT_PASSWORD` | str | MinIO 管理員密碼 |
+| `MINIO_API_PORT` | int | MinIO S3 API 端口 (預設 9000) |
+| `MINIO_CONSOLE_PORT` | int | MinIO Console 端口 (預設 9001) |
+
+#### Scenario: Docker 環境變數載入
+- **WHEN** 執行 `docker-compose --env-file .env.docker up`
+- **THEN** Docker 服務 SHALL 使用環境變數文件中的配置
+
+#### Scenario: 安全認證配置
+- **WHEN** 設定非預設的 MinIO 認證資訊
+- **THEN** MinIO 服務 SHALL 使用自訂認證
+
+---
+
+### Requirement: CORS Security Configuration
+系統 SHALL 要求明確配置 CORS 允許來源，禁止使用萬用字元。
+
+#### Scenario: CORS 來源配置
+- **WHEN** 設定 `CORS_ORIGINS=http://localhost:3000,https://example.com`
+- **THEN** 系統 SHALL 只接受來自這些來源的跨域請求
+
+#### Scenario: CORS 未配置
+- **WHEN** 未設定 `CORS_ORIGINS` 環境變數
+- **THEN** 系統 SHALL 拒絕啟動並顯示錯誤訊息
+
+#### Scenario: 開發環境 CORS
+- **WHEN** `DEBUG=True` 且 `CORS_ORIGINS` 包含 `http://localhost:3000`
+- **THEN** 開發環境前端 SHALL 能夠正常存取 API
+
+---
+
+### Requirement: Environment Example Files
+專案 SHALL 提供完整的環境變數範例檔案，包含所有可配置項目及說明。
+
+**必要範例檔案：**
+- `.env.example` - 後端環境變數範例
+- `frontend/.env.example` - 前端環境變數範例
+- `.env.docker.example` - Docker 部署環境變數範例
+
+#### Scenario: 新開發者設定環境
+- **WHEN** 新開發者複製 `.env.example` 到 `.env`
+- **THEN** 只需填入必要的 API 金鑰即可啟動開發環境
+
+#### Scenario: 生產部署設定
+- **WHEN** 運維人員參考 `.env.example` 設定生產環境
+- **THEN** 所有環境變數 SHALL 有明確的說明和範例值
diff --git a/openspec/changes/archive/2025-12-07-add-unified-env-config/tasks.md b/openspec/changes/archive/2025-12-07-add-unified-env-config/tasks.md
new file mode 100644
index 0000000..0c67e69
--- /dev/null
+++ b/openspec/changes/archive/2025-12-07-add-unified-env-config/tasks.md
@@ -0,0 +1,36 @@
+# Tasks: Unified Environment Configuration
+
+## 1. Backend Configuration Enhancement
+
+- [x] 1.1 擴展 `app/core/config.py` Settings 類別，新增所有環境變數
+- [x] 1.2 更新 `app/main.py` 使 CORS 來源從 `CORS_ORIGINS` 環境變數讀取
+- [x] 1.3 更新 `app/modules/realtime/router.py` 將硬編碼的 `SYSTEM_ADMIN_EMAIL` 改為環境變數
+- [x] 1.4 更新 `app/modules/auth/services/ad_client.py` 將 timeout 改為可配置
+- [x] 1.5 更新 `app/modules/realtime/services/message_service.py` 將訊息編輯時間限制改為可配置
+- [x] 1.6 更新 `app/modules/realtime/websocket_manager.py` 將打字超時改為可配置
+- [x] 1.7 更新 `app/modules/file_storage/validators.py` 將檔案大小限制改為可配置
+
+## 2. Frontend Configuration Enhancement
+
+- [x] 2.1 更新 `frontend/vite.config.ts` 使用環境變數設定端口和後端 URL
+- [x] 2.2 更新 `frontend/src/services/api.ts` 使用環境變數設定 API 超時
+- [x] 2.3 更新 `frontend/src/hooks/useMessages.ts` 使用環境變數設定重新取得間隔
+- [x] 2.4 更新 `frontend/src/hooks/useWebSocket.ts` 使用環境變數設定重連延遲
+- [x] 2.5 更新 `frontend/src/hooks/useReports.ts` 使用環境變數設定快取過期時間
+
+## 3. Docker Configuration
+
+- [x] 3.1 更新 `docker-compose.minio.yml` 使用環境變數取代硬編碼認證
+- [x] 3.2 創建 `.env.docker.example` 範例檔案
+
+## 4. Documentation Updates
+
+- [x] 4.1 更新根目錄 `.env.example` 包含所有後端環境變數及中英文說明
+- [x] 4.2 更新 `frontend/.env.example` 包含所有前端環境變數及說明
+- [x] 4.3 更新現有 `.env` 檔案包含所有新環境變數
+
+## 5. Testing & Validation
+
+- [x] 5.1 驗證所有環境變數有合理的預設值（開發環境可直接運行）
+- [x] 5.2 確保前端編譯成功
+- [x] 5.3 驗證後端配置正確載入
diff --git a/openspec/changes/archive/2025-12-07-migrate-sqlite-to-mysql/proposal.md b/openspec/changes/archive/2025-12-07-migrate-sqlite-to-mysql/proposal.md
new file mode 100644
index 0000000..514ad32
--- /dev/null
+++ b/openspec/changes/archive/2025-12-07-migrate-sqlite-to-mysql/proposal.md
@@ -0,0 +1,66 @@
+# Change: Migrate SQLite to MySQL with Table Prefix
+
+## Why
+
+目前專案使用 SQLite 作為開發資料庫，需要遷移到雲端 MySQL 資料庫以支援生產環境部署。由於 MySQL 資料庫 `db_A060` 會與其他專案共用，需要為所有資料表加上 `tr_` 前綴以避免命名衝突。
+
+**遷移目標：**
+- 完全移除 SQLite 支援，統一使用 MySQL
+- 所有資料表加上 `tr_` 前綴（例如 `users` → `tr_users`）
+- 使用 Alembic 進行資料庫版本控制和遷移管理
+- 確保遷移腳本只影響 `tr_` 前綴的資料表
+
+## What Changes
+
+### 1. Database Configuration
+- 更新 `DATABASE_URL` 環境變數格式支援 MySQL
+- 移除 `app/core/database.py` 中的 SQLite 特殊處理
+- 新增 MySQL 驅動相依套件 (`pymysql` 或 `mysqlclient`)
+
+### 2. Model Table Prefix (**BREAKING**)
+所有 10 個資料表將重新命名：
+
+| 原名稱 | 新名稱 |
+|--------|--------|
+| `users` | `tr_users` |
+| `user_sessions` | `tr_user_sessions` |
+| `incident_rooms` | `tr_incident_rooms` |
+| `room_members` | `tr_room_members` |
+| `room_templates` | `tr_room_templates` |
+| `messages` | `tr_messages` |
+| `message_reactions` | `tr_message_reactions` |
+| `message_edit_history` | `tr_message_edit_history` |
+| `generated_reports` | `tr_generated_reports` |
+| `room_files` | `tr_room_files` |
+
+### 3. Alembic Integration
+- 初始化 Alembic 遷移框架
+- 建立初始遷移腳本（建立所有 `tr_` 前綴資料表）
+- 移除 `app/main.py` 中的 `Base.metadata.create_all()` 自動建表
+
+### 4. Index and Constraint Naming
+- 更新所有索引名稱加上 `tr_` 前綴以避免衝突
+- 更新唯一約束名稱
+
+### 5. MySQL Compatibility
+- 確保 JSON 欄位在 MySQL 中正確運作
+- 確保 Enum 類型在 MySQL 中正確運作
+- 處理 MySQL 的字串長度限制（VARCHAR vs TEXT）
+
+## Impact
+
+- **Affected specs**: 新增 `database` spec
+- **Affected code**:
+  - `app/core/database.py` - 移除 SQLite 支援
+  - `app/core/config.py` - 可能新增資料表前綴設定
+  - `app/modules/*/models.py` - 所有 5 個 models.py 檔案更新 `__tablename__`
+  - `app/main.py` - 移除自動建表，改用 Alembic
+  - `requirements.txt` - 新增 `alembic`, `pymysql`
+  - `.env`, `.env.example` - 更新 DATABASE_URL 格式
+- **Breaking changes**:
+  - 所有資料表重新命名（需要重新建立資料庫或執行遷移）
+  - SQLite 不再支援
+  - 現有 SQLite 資料不會自動遷移（需手動處理）
+- **New files**:
+  - `alembic.ini` - Alembic 設定檔
+  - `alembic/` - 遷移腳本目錄
diff --git a/openspec/changes/archive/2025-12-07-migrate-sqlite-to-mysql/specs/database/spec.md b/openspec/changes/archive/2025-12-07-migrate-sqlite-to-mysql/specs/database/spec.md
new file mode 100644
index 0000000..b5c27c1
--- /dev/null
+++ b/openspec/changes/archive/2025-12-07-migrate-sqlite-to-mysql/specs/database/spec.md
@@ -0,0 +1,97 @@
+## ADDED Requirements
+
+### Requirement: MySQL Database Support
+系統 SHALL 使用 MySQL 作為唯一的資料庫後端，不再支援 SQLite。
+
+**MySQL 連線配置：**
+| 環境變數 | 格式 | 說明 |
+|---------|------|------|
+| `DATABASE_URL` | `mysql+pymysql://user:pass@host:port/database` | MySQL 連線字串 |
+
+#### Scenario: MySQL 連線成功
+- **WHEN** 提供有效的 MySQL 連線字串
+- **THEN** 系統 SHALL 成功連線到 MySQL 資料庫
+
+#### Scenario: MySQL 連線失敗
+- **WHEN** MySQL 伺服器無法連線
+- **THEN** 系統 SHALL 顯示明確的連線錯誤訊息並拒絕啟動
+
+---
+
+### Requirement: Table Prefix Convention
+所有資料表 SHALL 使用 `tr_` 前綴以避免與同資料庫中的其他專案發生命名衝突。
+
+**資料表命名規則：**
+- 所有資料表名稱以 `tr_` 開頭
+- 所有索引名稱以 `ix_tr_` 開頭
+- 所有唯一約束名稱以 `uq_tr_` 開頭
+
+**完整資料表清單：**
+| 模組 | 資料表名稱 |
+|------|-----------|
+| Auth | `tr_users`, `tr_user_sessions` |
+| Chat Room | `tr_incident_rooms`, `tr_room_members`, `tr_room_templates` |
+| Realtime | `tr_messages`, `tr_message_reactions`, `tr_message_edit_history` |
+| Report | `tr_generated_reports` |
+| File Storage | `tr_room_files` |
+
+#### Scenario: 資料表前綴驗證
+- **WHEN** 查詢資料庫中由本系統建立的資料表
+- **THEN** 所有資料表名稱 SHALL 以 `tr_` 開頭
+
+#### Scenario: 索引前綴驗證
+- **WHEN** 查詢資料庫中由本系統建立的索引
+- **THEN** 所有索引名稱 SHALL 以 `ix_tr_` 開頭
+
+---
+
+### Requirement: Alembic Database Migration
+系統 SHALL 使用 Alembic 進行資料庫結構版本控制和遷移管理。
+
+**Alembic 配置要求：**
+- 從環境變數 `DATABASE_URL` 讀取資料庫連線
+- 遷移腳本存放於 `alembic/versions/` 目錄
+- 支援 `alembic upgrade head` 和 `alembic downgrade` 指令
+
+#### Scenario: 執行資料庫遷移
+- **WHEN** 執行 `alembic upgrade head`
+- **THEN** 系統 SHALL 建立所有 `tr_` 前綴的資料表
+
+#### Scenario: 自動產生遷移腳本
+- **WHEN** 執行 `alembic revision --autogenerate`
+- **THEN** Alembic SHALL 比對 models 與資料庫結構並產生遷移腳本
+
+#### Scenario: 遷移腳本隔離
+- **WHEN** 執行任何 Alembic 遷移操作
+- **THEN** 只有 `tr_` 前綴的資料表會受到影響，其他專案的資料表不受影響
+
+---
+
+### Requirement: MySQL Connection Pooling
+系統 SHALL 使用連線池管理 MySQL 連線以提升效能和穩定性。
+
+**連線池配置：**
+| 參數 | 預設值 | 說明 |
+|------|--------|------|
+| `pool_size` | 5 | 連線池大小 |
+| `max_overflow` | 10 | 最大額外連線數 |
+| `pool_recycle` | 3600 | 連線回收時間（秒） |
+
+#### Scenario: 連線池運作
+- **WHEN** 多個 API 請求同時存取資料庫
+- **THEN** 系統 SHALL 從連線池取得連線而非每次建立新連線
+
+#### Scenario: 連線回收
+- **WHEN** 連線閒置超過 `pool_recycle` 時間
+- **THEN** 系統 SHALL 自動回收並建立新連線以避免 MySQL 的 wait_timeout 問題
+
+---
+
+## REMOVED Requirements
+
+### Requirement: SQLite Support
+**Reason**: 專案已完全遷移至 MySQL，不再需要 SQLite 支援
+**Migration**:
+- 移除 `app/core/database.py` 中的 SQLite 特殊處理（`check_same_thread`）
+- 更新 `.env.example` 移除 SQLite 連線範例
+- 現有 SQLite 資料需手動遷移或重新建立
diff --git a/openspec/changes/archive/2025-12-07-migrate-sqlite-to-mysql/tasks.md b/openspec/changes/archive/2025-12-07-migrate-sqlite-to-mysql/tasks.md
new file mode 100644
index 0000000..79c7bd1
--- /dev/null
+++ b/openspec/changes/archive/2025-12-07-migrate-sqlite-to-mysql/tasks.md
@@ -0,0 +1,49 @@
+# Tasks: Migrate SQLite to MySQL
+
+## 1. Dependencies Setup
+
+- [x] 1.1 新增 `pymysql` 到 requirements.txt
+- [x] 1.2 新增 `alembic` 到 requirements.txt
+- [x] 1.3 安裝新相依套件
+
+## 2. Model Updates (Add tr_ Prefix)
+
+- [x] 2.1 更新 `app/modules/auth/models.py` - `tr_users`, `tr_user_sessions`
+- [x] 2.2 更新 `app/modules/chat_room/models.py` - `tr_incident_rooms`, `tr_room_members`, `tr_room_templates`
+- [x] 2.3 更新 `app/modules/realtime/models.py` - `tr_messages`, `tr_message_reactions`, `tr_message_edit_history`
+- [x] 2.4 更新 `app/modules/report_generation/models.py` - `tr_generated_reports`
+- [x] 2.5 更新 `app/modules/file_storage/models.py` - `tr_room_files`
+- [x] 2.6 更新所有索引和約束名稱加上 `tr_` 前綴
+
+## 3. Database Core Updates
+
+- [x] 3.1 更新 `app/core/database.py` 移除 SQLite 特殊處理，加入 MySQL 連線池設定
+- [x] 3.2 更新 `app/main.py` 移除 `Base.metadata.create_all()` 自動建表
+
+## 4. Alembic Setup
+
+- [x] 4.1 執行 `alembic init alembic` 初始化 Alembic
+- [x] 4.2 設定 `alembic/env.py` 使用環境變數讀取 DATABASE_URL
+- [x] 4.3 更新 `alembic/env.py` 設定 target_metadata 和 `tr_alembic_version` 版本表
+- [x] 4.4 建立初始遷移腳本 `alembic revision --autogenerate -m "Initial migration - create tr_ prefixed tables"`
+
+## 5. Environment Configuration
+
+- [x] 5.1 更新 `.env` 使用 MySQL 連線字串
+- [x] 5.2 更新 `.env.example` 提供 MySQL 連線範例
+- [x] 5.3 移除 SQLite 相關註解和範例
+
+## 6. Database Migration
+
+- [x] 6.1 執行 `alembic upgrade head` 建立資料表
+- [x] 6.2 驗證所有資料表正確建立於 MySQL (11 個 tr_ 前綴表格)
+
+## 7. Cleanup
+
+- [x] 7.1 刪除本地 SQLite 資料庫檔案 `task_reporter.db`
+- [x] 7.2 確認 `.gitignore` 包含 `*.db` 規則
+
+## 8. Testing
+
+- [x] 8.1 驗證後端應用程式可正常啟動並連接 MySQL
+- [x] 8.2 驗證資料庫 CRUD 操作正常 (tr_room_templates 查詢成功)
diff --git a/openspec/specs/env-config/spec.md b/openspec/specs/env-config/spec.md
new file mode 100644
index 0000000..94d83ac
--- /dev/null
+++ b/openspec/specs/env-config/spec.md
@@ -0,0 +1,162 @@
+# env-config Specification
+
+## Purpose
+TBD - created by archiving change add-unified-env-config. Update Purpose after archive.
+## Requirements
+### Requirement: Centralized Backend Configuration
+系統 SHALL 透過 `app/core/config.py` 中的 Settings 類別集中管理所有後端配置，並從環境變數讀取設定值。
+
+**必要環境變數：**
+| 變數名稱 | 類型 | 預設值 | 說明 |
+|---------|------|--------|------|
+| `DATABASE_URL` | str | (必填) | 資料庫連線字串 |
+| `FERNET_KEY` | str | (必填) | 加密金鑰 |
+| `AD_API_URL` | str | (必填) | AD 認證 API URL |
+| `HOST` | str | `0.0.0.0` | 伺服器綁定位址 |
+| `PORT` | int | `8000` | 伺服器端口 |
+| `DEBUG` | bool | `False` | 除錯模式 |
+| `LOG_LEVEL` | str | `INFO` | 日誌等級 (DEBUG/INFO/WARNING/ERROR) |
+| `CORS_ORIGINS` | str | (必填) | 允許的 CORS 來源，逗號分隔 |
+| `SYSTEM_ADMIN_EMAIL` | str | (必填) | 系統管理員信箱 |
+| `AD_API_TIMEOUT_SECONDS` | int | `10` | AD API 請求超時秒數 |
+| `SESSION_INACTIVITY_DAYS` | int | `3` | 會話閒置過期天數 |
+| `TOKEN_REFRESH_THRESHOLD_MINUTES` | int | `5` | Token 更新閾值分鐘數 |
+| `MAX_REFRESH_ATTEMPTS` | int | `3` | 最大 Token 更新嘗試次數 |
+| `MESSAGE_EDIT_TIME_LIMIT_MINUTES` | int | `15` | 訊息編輯時間限制分鐘數 |
+| `TYPING_TIMEOUT_SECONDS` | int | `3` | 打字指示器超時秒數 |
+
+#### Scenario: 必要環境變數缺失時啟動失敗
+- **WHEN** 啟動應用程式時缺少必要環境變數（如 `DATABASE_URL`）
+- **THEN** 應用程式 SHALL 顯示明確錯誤訊息並拒絕啟動
+
+#### Scenario: 使用預設值啟動
+- **WHEN** 提供所有必要環境變數但未設定選填變數
+- **THEN** 系統 SHALL 使用預設值正常啟動
+
+---
+
+### Requirement: File Storage Configuration
+系統 SHALL 支援透過環境變數配置檔案儲存相關設定。
+
+**環境變數：**
+| 變數名稱 | 類型 | 預設值 | 說明 |
+|---------|------|--------|------|
+| `MINIO_ENDPOINT` | str | `localhost:9000` | MinIO 伺服器位址 |
+| `MINIO_ACCESS_KEY` | str | `minioadmin` | MinIO 存取金鑰 |
+| `MINIO_SECRET_KEY` | str | `minioadmin` | MinIO 密鑰 |
+| `MINIO_BUCKET` | str | `task-reporter-files` | 預設儲存桶名稱 |
+| `MINIO_SECURE` | bool | `False` | 是否使用 HTTPS |
+| `IMAGE_MAX_SIZE_MB` | int | `10` | 圖片最大上傳大小 (MB) |
+| `DOCUMENT_MAX_SIZE_MB` | int | `20` | 文件最大上傳大小 (MB) |
+| `LOG_MAX_SIZE_MB` | int | `5` | 日誌檔最大上傳大小 (MB) |
+
+#### Scenario: 自訂檔案大小限制
+- **WHEN** 設定 `IMAGE_MAX_SIZE_MB=20`
+- **THEN** 系統 SHALL 接受最大 20MB 的圖片上傳
+
+#### Scenario: MinIO 連線配置
+- **WHEN** 設定自訂 MinIO 端點和認證資訊
+- **THEN** 系統 SHALL 使用該配置連線 MinIO 服務
+
+---
+
+### Requirement: AI Service Configuration
+系統 SHALL 支援透過環境變數配置 AI 報告生成服務。
+
+**環境變數：**
+| 變數名稱 | 類型 | 預設值 | 說明 |
+|---------|------|--------|------|
+| `DIFY_BASE_URL` | str | `https://dify.theaken.com/v1` | DIFY API 基礎 URL |
+| `DIFY_API_KEY` | str | `""` | DIFY API 金鑰 |
+| `DIFY_TIMEOUT_SECONDS` | int | `120` | DIFY API 請求超時秒數 |
+| `REPORT_MAX_MESSAGES` | int | `200` | 報告包含的最大訊息數 |
+| `REPORT_STORAGE_PATH` | str | `reports` | 報告儲存路徑 |
+
+#### Scenario: DIFY API 配置
+- **WHEN** 設定有效的 `DIFY_API_KEY`
+- **THEN** 系統 SHALL 能夠呼叫 DIFY API 生成報告
+
+#### Scenario: DIFY API 金鑰缺失
+- **WHEN** 未設定 `DIFY_API_KEY` 或設為空字串
+- **THEN** 報告生成功能 SHALL 返回適當錯誤訊息
+
+---
+
+### Requirement: Frontend Environment Configuration
+前端應用程式 SHALL 透過 Vite 環境變數機制配置運行時設定。
+
+**環境變數：**
+| 變數名稱 | 類型 | 預設值 | 說明 |
+|---------|------|--------|------|
+| `VITE_API_BASE_URL` | str | `""` | API 基礎 URL（空字串表示相對路徑） |
+| `VITE_PORT` | int | `3000` | 開發伺服器端口 |
+| `VITE_BACKEND_URL` | str | `http://localhost:8000` | 後端 API URL（開發代理用） |
+| `VITE_API_TIMEOUT_MS` | int | `30000` | API 請求超時毫秒數 |
+| `VITE_MESSAGES_REFETCH_INTERVAL_MS` | int | `30000` | 訊息重新取得間隔毫秒數 |
+| `VITE_MAX_RECONNECT_DELAY_MS` | int | `30000` | WebSocket 最大重連延遲毫秒數 |
+| `VITE_REPORTS_STALE_TIME_MS` | int | `30000` | 報告快取過期時間毫秒數 |
+
+#### Scenario: 開發環境配置
+- **WHEN** 在開發環境執行 `npm run dev`
+- **THEN** 前端 SHALL 使用 `VITE_BACKEND_URL` 設定代理轉發 API 請求
+
+#### Scenario: 生產環境配置
+- **WHEN** 建置生產版本並設定 `VITE_API_BASE_URL`
+- **THEN** 前端 SHALL 使用該 URL 作為 API 請求基礎路徑
+
+---
+
+### Requirement: Docker Environment Configuration
+Docker 部署 SHALL 支援透過環境變數文件配置所有服務。
+
+**Docker Compose 支援的環境變數：**
+| 變數名稱 | 類型 | 說明 |
+|---------|------|------|
+| `MINIO_ROOT_USER` | str | MinIO 管理員帳號 |
+| `MINIO_ROOT_PASSWORD` | str | MinIO 管理員密碼 |
+| `MINIO_API_PORT` | int | MinIO S3 API 端口 (預設 9000) |
+| `MINIO_CONSOLE_PORT` | int | MinIO Console 端口 (預設 9001) |
+
+#### Scenario: Docker 環境變數載入
+- **WHEN** 執行 `docker-compose --env-file .env.docker up`
+- **THEN** Docker 服務 SHALL 使用環境變數文件中的配置
+
+#### Scenario: 安全認證配置
+- **WHEN** 設定非預設的 MinIO 認證資訊
+- **THEN** MinIO 服務 SHALL 使用自訂認證
+
+---
+
+### Requirement: CORS Security Configuration
+系統 SHALL 要求明確配置 CORS 允許來源，禁止使用萬用字元。
+
+#### Scenario: CORS 來源配置
+- **WHEN** 設定 `CORS_ORIGINS=http://localhost:3000,https://example.com`
+- **THEN** 系統 SHALL 只接受來自這些來源的跨域請求
+
+#### Scenario: CORS 未配置
+- **WHEN** 未設定 `CORS_ORIGINS` 環境變數
+- **THEN** 系統 SHALL 拒絕啟動並顯示錯誤訊息
+
+#### Scenario: 開發環境 CORS
+- **WHEN** `DEBUG=True` 且 `CORS_ORIGINS` 包含 `http://localhost:3000`
+- **THEN** 開發環境前端 SHALL 能夠正常存取 API
+
+---
+
+### Requirement: Environment Example Files
+專案 SHALL 提供完整的環境變數範例檔案，包含所有可配置項目及說明。
+
+**必要範例檔案：**
+- `.env.example` - 後端環境變數範例
+- `frontend/.env.example` - 前端環境變數範例
+- `.env.docker.example` - Docker 部署環境變數範例
+
+#### Scenario: 新開發者設定環境
+- **WHEN** 新開發者複製 `.env.example` 到 `.env`
+- **THEN** 只需填入必要的 API 金鑰即可啟動開發環境
+
+#### Scenario: 生產部署設定
+- **WHEN** 運維人員參考 `.env.example` 設定生產環境
+- **THEN** 所有環境變數 SHALL 有明確的說明和範例值
+
diff --git a/requirements.txt b/requirements.txt
index 1f68d70..38aa22a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ python-multipart==0.0.6
 
 # Database
 sqlalchemy==2.0.25
-psycopg2-binary==2.9.9
+pymysql==1.1.0
 alembic==1.13.1
 
 # Object Storage
diff --git a/test_chat_room.py b/tests/test_chat_room.py
similarity index 100%
rename from test_chat_room.py
rename to tests/test_chat_room.py
diff --git a/test_realtime_implementation.py b/tests/test_realtime_implementation.py
similarity index 99%
rename from test_realtime_implementation.py
rename to tests/test_realtime_implementation.py
index 1cbab5e..4ed4ac4 100644
--- a/test_realtime_implementation.py
+++ b/tests/test_realtime_implementation.py
@@ -7,7 +7,7 @@ import sys
 import os
 
 # Add project root to path
-sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 from sqlalchemy import inspect
 from app.core.database import engine, SessionLocal
diff --git a/test_websocket.py b/tests/test_websocket.py
similarity index 100%
rename from test_websocket.py
rename to tests/test_websocket.py