Initial commit: Pixel AI comic/video creation platform

- FastAPI backend with SQLModel, Alembic migrations, AgentScope agents
- Next.js 15 frontend with React 19, Tailwind, Zustand, React Flow
- Multi-provider AI system (DashScope, Kling, MiniMax, Volcengine, OpenAI, etc.)
- All HTTP clients migrated from sync requests to async httpx
- Admin-managed API keys via environment variables
- SSRF vulnerability fixed in ensure_url()

backend/alembic/versions/add_indexes_and_optimizations.py

@@ -0,0 +1,100 @@
+"""Add indexes and database optimizations
+
+Revision ID: add_indexes_opt
+Revises: bfac9b8e32f5
+Create Date: 2026-01-14 10:00:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'add_indexes_opt'
+down_revision: Union[str, Sequence[str], None] = 'bfac9b8e32f5'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Add indexes, soft delete columns, and full-text search support."""
+    
+    # Add soft delete columns
+    op.add_column('projects', sa.Column('deleted_at', sa.Float(), nullable=True))
+    op.add_column('assets', sa.Column('deleted_at', sa.Float(), nullable=True))
+    op.add_column('episodes', sa.Column('deleted_at', sa.Float(), nullable=True))
+    op.add_column('storyboards', sa.Column('deleted_at', sa.Float(), nullable=True))
+    op.add_column('tasks', sa.Column('deleted_at', sa.Float(), nullable=True))
+    
+    # Add indexes for frequently queried fields on projects
+    op.create_index('idx_projects_created_at', 'projects', ['created_at'])
+    op.create_index('idx_projects_updated_at', 'projects', ['updated_at'])
+    op.create_index('idx_projects_status', 'projects', ['status'])
+    op.create_index('idx_projects_deleted_at', 'projects', ['deleted_at'])
+    
+    # Add indexes for tasks
+    op.create_index('idx_tasks_status', 'tasks', ['status'])
+    op.create_index('idx_tasks_type', 'tasks', ['type'])
+    op.create_index('idx_tasks_created_at', 'tasks', ['created_at'])
+    op.create_index('idx_tasks_type_status', 'tasks', ['type', 'status'])
+    op.create_index('idx_tasks_deleted_at', 'tasks', ['deleted_at'])
+    
+    # Add indexes for assets
+    op.create_index('idx_assets_type', 'assets', ['type'])
+    op.create_index('idx_assets_deleted_at', 'assets', ['deleted_at'])
+    
+    # Add indexes for episodes
+    op.create_index('idx_episodes_status', 'episodes', ['status'])
+    op.create_index('idx_episodes_order_index', 'episodes', ['order_index'])
+    op.create_index('idx_episodes_deleted_at', 'episodes', ['deleted_at'])
+    
+    # Add indexes for storyboards
+    op.create_index('idx_storyboards_type', 'storyboards', ['type'])
+    op.create_index('idx_storyboards_order_index', 'storyboards', ['order_index'])
+    op.create_index('idx_storyboards_deleted_at', 'storyboards', ['deleted_at'])
+    
+    # Note: SQLite doesn't support full-text search indexes like PostgreSQL
+    # For SQLite, we'll use the FTS5 virtual table approach in the application layer
+    # or use LIKE queries with indexes on the name columns
+    # Adding index on name columns for better LIKE query performance
+    op.create_index('idx_projects_name', 'projects', ['name'])
+    op.create_index('idx_assets_name', 'assets', ['name'])
+
+
+def downgrade() -> None:
+    """Remove indexes, soft delete columns, and full-text search support."""
+    
+    # Drop indexes
+    op.drop_index('idx_assets_name', table_name='assets')
+    op.drop_index('idx_projects_name', table_name='projects')
+    
+    op.drop_index('idx_storyboards_deleted_at', table_name='storyboards')
+    op.drop_index('idx_storyboards_order_index', table_name='storyboards')
+    op.drop_index('idx_storyboards_type', table_name='storyboards')
+    
+    op.drop_index('idx_episodes_deleted_at', table_name='episodes')
+    op.drop_index('idx_episodes_order_index', table_name='episodes')
+    op.drop_index('idx_episodes_status', table_name='episodes')
+    
+    op.drop_index('idx_assets_deleted_at', table_name='assets')
+    op.drop_index('idx_assets_type', table_name='assets')
+    
+    op.drop_index('idx_tasks_deleted_at', table_name='tasks')
+    op.drop_index('idx_tasks_type_status', table_name='tasks')
+    op.drop_index('idx_tasks_created_at', table_name='tasks')
+    op.drop_index('idx_tasks_type', table_name='tasks')
+    op.drop_index('idx_tasks_status', table_name='tasks')
+    
+    op.drop_index('idx_projects_deleted_at', table_name='projects')
+    op.drop_index('idx_projects_status', table_name='projects')
+    op.drop_index('idx_projects_updated_at', table_name='projects')
+    op.drop_index('idx_projects_created_at', table_name='projects')
+    
+    # Drop soft delete columns
+    op.drop_column('tasks', 'deleted_at')
+    op.drop_column('storyboards', 'deleted_at')
+    op.drop_column('episodes', 'deleted_at')
+    op.drop_column('assets', 'deleted_at')
+    op.drop_column('projects', 'deleted_at')