Add DEMO feature to the project

services/demo_session/migrations/env.py

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+"""Alembic environment for demo_session service"""
+
+from logging.config import fileConfig
+from sqlalchemy import engine_from_config, pool
+from alembic import context
+import os
+import sys
+from pathlib import Path
+
+# Add service root to path for container environment
+service_root = Path(__file__).parent.parent
+sys.path.insert(0, str(service_root))
+
+# Also add project root for local development
+project_root = Path(__file__).parent.parent.parent.parent
+sys.path.insert(0, str(project_root))
+
+# Import models - try container path first, then dev path
+try:
+    from app.models import *
+    from shared.database.base import Base
+except ImportError:
+    from services.demo_session.app.models import *
+    from shared.database.base import Base
+
+# this is the Alembic Config object
+config = context.config
+
+# Set database URL from environment
+database_url = os.getenv("DEMO_SESSION_DATABASE_URL")
+if database_url:
+    # Convert asyncpg URL to psycopg2 for synchronous migrations
+    database_url = database_url.replace("postgresql+asyncpg://", "postgresql://")
+    config.set_main_option("sqlalchemy.url", database_url)
+
+# Interpret the config file for Python logging
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+target_metadata = Base.metadata
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode."""
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode."""
+    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
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

services/demo_session/migrations/script.py.mako

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+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}

services/demo_session/migrations/versions/20251002_initial_schema.py

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+"""initial_schema
+
+Revision ID: a1b2c3d4e5f6
+Revises:
+Create Date: 2025-10-02 17:45:00.000000+02:00
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision: str = 'a1b2c3d4e5f6'
+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:
+    # Create demo_sessions table
+    op.create_table('demo_sessions',
+        sa.Column('id', postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column('session_id', sa.String(length=100), nullable=False),
+        sa.Column('user_id', postgresql.UUID(as_uuid=True), nullable=True),
+        sa.Column('ip_address', sa.String(length=45), nullable=True),
+        sa.Column('user_agent', sa.String(length=500), nullable=True),
+        sa.Column('base_demo_tenant_id', postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column('virtual_tenant_id', postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column('demo_account_type', sa.String(length=50), nullable=False),
+        sa.Column('status', sa.Enum('active', 'expired', 'destroyed', name='demosessionstatus'), nullable=True),
+        sa.Column('created_at', sa.DateTime(timezone=True), nullable=True),
+        sa.Column('expires_at', sa.DateTime(timezone=True), nullable=False),
+        sa.Column('last_activity_at', sa.DateTime(timezone=True), nullable=True),
+        sa.Column('destroyed_at', sa.DateTime(timezone=True), nullable=True),
+        sa.Column('request_count', sa.Integer(), nullable=True),
+        sa.Column('data_cloned', sa.Boolean(), nullable=True),
+        sa.Column('redis_populated', sa.Boolean(), nullable=True),
+        sa.Column('session_metadata', postgresql.JSONB(astext_type=sa.Text()), nullable=True),
+        sa.PrimaryKeyConstraint('id'),
+        sa.UniqueConstraint('session_id')
+    )
+
+    # Create indexes
+    op.create_index(op.f('ix_demo_sessions_session_id'), 'demo_sessions', ['session_id'], unique=False)
+    op.create_index(op.f('ix_demo_sessions_base_demo_tenant_id'), 'demo_sessions', ['base_demo_tenant_id'], unique=False)
+    op.create_index(op.f('ix_demo_sessions_virtual_tenant_id'), 'demo_sessions', ['virtual_tenant_id'], unique=False)
+    op.create_index(op.f('ix_demo_sessions_status'), 'demo_sessions', ['status'], unique=False)
+    op.create_index(op.f('ix_demo_sessions_created_at'), 'demo_sessions', ['created_at'], unique=False)
+    op.create_index(op.f('ix_demo_sessions_expires_at'), 'demo_sessions', ['expires_at'], unique=False)
+
+
+def downgrade() -> None:
+    # Drop indexes
+    op.drop_index(op.f('ix_demo_sessions_expires_at'), table_name='demo_sessions')
+    op.drop_index(op.f('ix_demo_sessions_created_at'), table_name='demo_sessions')
+    op.drop_index(op.f('ix_demo_sessions_status'), table_name='demo_sessions')
+    op.drop_index(op.f('ix_demo_sessions_virtual_tenant_id'), table_name='demo_sessions')
+    op.drop_index(op.f('ix_demo_sessions_base_demo_tenant_id'), table_name='demo_sessions')
+    op.drop_index(op.f('ix_demo_sessions_session_id'), table_name='demo_sessions')
+
+    # Drop table (this will automatically drop the enum if it's only used here)
+    op.drop_table('demo_sessions')