feat: Alembic setup, User and AuditLog models with migration

Co-Authored-By: Claude <noreply@anthropic.com>

backend/alembic/README

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+Generic single-database configuration.

backend/alembic/env.py

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+from logging.config import fileConfig
+
+from alembic import context
+
+from app.config import settings
+from app.database import Base
+from app.models import *  # noqa: F401,F403
+
+config = context.config
+
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+target_metadata = Base.metadata
+
+
+def run_migrations_offline():
+    url = settings.database_url
+    context.configure(url=url, target_metadata=target_metadata, literal_binds=True)
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def do_run_migrations(connection):
+    context.configure(connection=connection, target_metadata=target_metadata)
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+async def run_async_migrations():
+    from app.database import engine
+
+    async with engine.begin() as conn:
+        await conn.run_sync(do_run_migrations)
+
+
+def run_migrations_online():
+    import asyncio
+
+    asyncio.run(run_async_migrations())
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

backend/alembic/script.py.mako

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+"""${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, Sequence[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:
+    """Upgrade schema."""
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    ${downgrades if downgrades else "pass"}

backend/alembic/versions/ab0c56ae4242_create_users_and_audit_logs_tables.py

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+"""create users and audit_logs tables
+
+Revision ID: ab0c56ae4242
+Revises:
+Create Date: 2026-07-22 16:25:22.698619
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'ab0c56ae4242'
+down_revision: Union[str, Sequence[str], None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        'users',
+        sa.Column('id', sa.String(36), primary_key=True),
+        sa.Column('username', sa.String(50), unique=True, nullable=False, index=True),
+        sa.Column('email', sa.String(255), unique=True, nullable=False),
+        sa.Column('hashed_password', sa.String(255), nullable=False),
+        sa.Column(
+            'role',
+            sa.Enum('owner', 'operator', 'viewer', name='userrole'),
+            nullable=False,
+            server_default='viewer',
+        ),
+        sa.Column('is_active', sa.Boolean, nullable=False, server_default=sa.true()),
+        sa.Column('is_approved', sa.Boolean, nullable=False, server_default=sa.false()),
+        sa.Column('login_attempts', sa.Integer, nullable=False, server_default='0'),
+        sa.Column('locked_until', sa.DateTime, nullable=True),
+        sa.Column('created_at', sa.DateTime, nullable=False, server_default=sa.func.now()),
+        sa.Column('updated_at', sa.DateTime, nullable=False, server_default=sa.func.now()),
+    )
+
+    op.create_table(
+        'audit_logs',
+        sa.Column('id', sa.String(36), primary_key=True),
+        sa.Column('user_id', sa.String(36), nullable=False, index=True),
+        sa.Column('username', sa.String(50), nullable=False),
+        sa.Column('action', sa.String(100), nullable=False, index=True),
+        sa.Column('target', sa.String(255), nullable=False),
+        sa.Column('detail', sa.Text, nullable=True),
+        sa.Column('ip_address', sa.String(45), nullable=True),
+        sa.Column('created_at', sa.DateTime, nullable=False, server_default=sa.func.now()),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table('audit_logs')
+    op.drop_table('users')
+    op.execute('DROP TYPE IF EXISTS userrole')