Phase 3 Complete: Python API Foundation (T027-T038)

Completed all Python API infrastructure tasks:

✅ Core Application (T027-T029):
- FastAPI app with CORS, error handling, structured logging
- Pydantic Settings for environment configuration
- SQLAlchemy async engine with connection pooling
- Alembic migration environment

✅ Infrastructure Clients (T030-T032):
- Redis async client with connection pooling
- gRPC SDK Bridge client (placeholder for protobuf generation)
- Alembic migration environment configured

✅ Utilities & Middleware (T033-T035):
- JWT utilities: create, decode, verify tokens (access & refresh)
- Error translation: gRPC status codes → HTTP status codes
- Error handler middleware for consistent error responses

✅ Database Models (T036-T038):
- User model with RBAC (viewer, operator, administrator)
- AuditLog model for tracking all operations
- Initial migration: creates users and audit_logs tables
- Default admin user (username: admin, password: admin123)

Features:
- Async/await throughout
- Type hints with Pydantic
- Structured JSON logging
- Connection pooling (DB, Redis, gRPC)
- Environment-based configuration
- Permission hierarchy system

Ready for Phase 4: Authentication Implementation

🤖 Generated with Claude Code

src/api/migrations/versions/20251208_initial_schema.py

@@ -0,0 +1,78 @@
+"""Initial schema: users and audit_logs tables
+
+Revision ID: 001_initial
+Revises:
+Create Date: 2025-12-08
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects.postgresql import UUID, JSONB
+
+# revision identifiers, used by Alembic.
+revision = '001_initial'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+def upgrade() -> None:
+    """Create initial tables"""
+
+    # Create users table
+    op.create_table(
+        'users',
+        sa.Column('id', UUID(as_uuid=True), primary_key=True),
+        sa.Column('username', sa.String(50), nullable=False, unique=True),
+        sa.Column('password_hash', sa.String(255), nullable=False),
+        sa.Column('role', sa.Enum('viewer', 'operator', 'administrator', name='userrole'), nullable=False),
+        sa.Column('created_at', sa.DateTime(), nullable=False),
+        sa.Column('updated_at', sa.DateTime(), nullable=False),
+    )
+
+    # Create index on username for faster lookups
+    op.create_index('ix_users_username', 'users', ['username'])
+
+    # Create audit_logs table
+    op.create_table(
+        'audit_logs',
+        sa.Column('id', UUID(as_uuid=True), primary_key=True),
+        sa.Column('user_id', UUID(as_uuid=True), nullable=True),
+        sa.Column('action', sa.String(100), nullable=False),
+        sa.Column('target', sa.String(255), nullable=True),
+        sa.Column('outcome', sa.String(20), nullable=False),
+        sa.Column('timestamp', sa.DateTime(), nullable=False),
+        sa.Column('details', JSONB, nullable=True),
+        sa.Column('ip_address', sa.String(45), nullable=True),
+        sa.Column('user_agent', sa.Text(), nullable=True),
+        sa.ForeignKeyConstraint(['user_id'], ['users.id'], ondelete='SET NULL'),
+    )
+
+    # Create indexes for faster queries
+    op.create_index('ix_audit_logs_action', 'audit_logs', ['action'])
+    op.create_index('ix_audit_logs_timestamp', 'audit_logs', ['timestamp'])
+
+    # Insert default admin user (password: admin123 - CHANGE IN PRODUCTION!)
+    # Hash generated with: passlib.hash.bcrypt.hash("admin123")
+    op.execute("""
+        INSERT INTO users (id, username, password_hash, role, created_at, updated_at)
+        VALUES (
+            gen_random_uuid(),
+            'admin',
+            '$2b$12$LQv3c1yqBWVHxkd0LHAkCOYz6TtxMQJqhN8/LewY5ufUfVwq7z.lW',
+            'administrator',
+            NOW(),
+            NOW()
+        )
+    """)
+
+def downgrade() -> None:
+    """Drop tables"""
+    op.drop_index('ix_audit_logs_timestamp', 'audit_logs')
+    op.drop_index('ix_audit_logs_action', 'audit_logs')
+    op.drop_table('audit_logs')
+
+    op.drop_index('ix_users_username', 'users')
+    op.drop_table('users')
+
+    # Drop enum type
+    op.execute('DROP TYPE userrole')