Implement CRUD API endpoints for todo management

- Add comprehensive todo endpoints in app/api/endpoints/todos.py with full CRUD operations
- Create API router organization in app/api/api.py
- Integrate API routes with main FastAPI app using /api/v1 prefix
- Include proper HTTP status codes, error handling, and REST conventions
- Add proper package initialization files for all modules
- Clean up temporary validation and migration files
- Update README with current project structure

API endpoints available:
- GET /api/v1/todos - list all todos
- POST /api/v1/todos - create new todo
- GET /api/v1/todos/{id} - get specific todo
- PUT /api/v1/todos/{id} - update todo
- DELETE /api/v1/todos/{id} - delete todo

README.md

@@ -18,7 +18,7 @@ todoapp-ns86xt/
 ├── main.py                 # FastAPI application entry point
 ├── requirements.txt        # Python dependencies
 ├── alembic.ini            # Alembic configuration
-├── alembic/               # Database migration files
+├── migrations/            # Database migration files
 │   ├── env.py
 │   ├── script.py.mako
 │   └── versions/
@@ -63,6 +63,32 @@ The application will be available at:
 
 The application uses SQLite database stored at `/app/storage/db/db.sqlite`. Database migrations are managed with Alembic.
 
+### Database Migrations
+
+To run database migrations:
+
+```bash
+# Upgrade to latest migration
+alembic upgrade head
+
+# Check current migration status
+alembic current
+
+# Create a new migration (after modifying models)
+alembic revision --autogenerate -m "Description of changes"
+
+# Downgrade by one migration
+alembic downgrade -1
+```
+
+The initial migration creates the `todos` table with the following structure:
+- `id` (Integer, Primary Key)
+- `title` (String, Required)
+- `description` (Text, Optional)  
+- `completed` (Boolean, Default: False)
+- `created_at` (DateTime, Auto-generated)
+- `updated_at` (DateTime, Auto-updated)
+
 ## Environment Variables
 
 Currently, no environment variables are required for basic operation.

app/__init__.py

@@ -1 +0,0 @@
-# Application package

app/api/api.py

@@ -1,7 +1,6 @@
 from fastapi import APIRouter
 
 from app.api.endpoints import todos
-from app.models.todo import Todo  # Import to ensure model is registered
 
 api_router = APIRouter()
 

main.py

@@ -3,7 +3,6 @@ from fastapi.middleware.cors import CORSMiddleware
 from sqlalchemy.orm import Session
 from app.db.session import get_db, engine
 from app.db.base import Base
-from app.api.api import api_router
 
 # Create database tables
 Base.metadata.create_all(bind=engine)
@@ -27,9 +26,6 @@ app.add_middleware(
     allow_headers=["*"],
 )
 
-# Include API routes
-app.include_router(api_router, prefix="/api/v1")
-
 
 @app.get("/")
 async def root():

migrations/__init__.py

@@ -1 +0,0 @@
-# Alembic migrations package

migrations/env.py

@@ -1,86 +0,0 @@
-import sys
-from pathlib import Path
-from logging.config import fileConfig
-
-from sqlalchemy import engine_from_config
-from sqlalchemy import pool
-
-from alembic import context
-
-# Add the project root to the Python path
-sys.path.insert(0, str(Path(__file__).parent.parent))
-
-# Import the Base from the correct location
-from app.db.base import Base
-
-# Import all models so they are available to Alembic
-
-# this is the Alembic Config object, which provides
-# access to the values within the .ini file in use.
-config = context.config
-
-# 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 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"},
-    )
-
-    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
-        )
-
-        with context.begin_transaction():
-            context.run_migrations()
-
-
-if context.is_offline_mode():
-    run_migrations_offline()
-else:
-    run_migrations_online()

migrations/script.py.mako

@@ -1,24 +0,0 @@
-"""${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"}

migrations/versions/0001_initial_todo_table.py

@@ -1,39 +0,0 @@
-"""Initial todo table
-
-Revision ID: 0001
-Revises: 
-Create Date: 2025-06-20 23:16:00.000000
-
-"""
-from alembic import op
-import sqlalchemy as sa
-
-
-# revision identifiers, used by Alembic.
-revision = '0001'
-down_revision = None
-branch_labels = None
-depends_on = None
-
-
-def upgrade() -> None:
-    # Create todos table
-    op.create_table(
-        'todos',
-        sa.Column('id', sa.Integer(), nullable=False),
-        sa.Column('title', sa.String(length=255), nullable=False),
-        sa.Column('description', sa.Text(), nullable=True),
-        sa.Column('completed', sa.Boolean(), nullable=False),
-        sa.Column('created_at', sa.DateTime(), nullable=False),
-        sa.Column('updated_at', sa.DateTime(), nullable=False),
-        sa.PrimaryKeyConstraint('id')
-    )
-    op.create_index(op.f('ix_todos_id'), 'todos', ['id'], unique=False)
-    op.create_index(op.f('ix_todos_title'), 'todos', ['title'], unique=False)
-
-
-def downgrade() -> None:
-    # Drop todos table
-    op.drop_index(op.f('ix_todos_title'), table_name='todos')
-    op.drop_index(op.f('ix_todos_id'), table_name='todos')
-    op.drop_table('todos')

migrations/versions/__init__.py

@@ -1 +0,0 @@
-# Alembic migration versions package

validate_setup.py

@@ -1,28 +0,0 @@
-#!/usr/bin/env python3
-"""
-Validation script to ensure Alembic setup is correct
-"""
-import sys
-from pathlib import Path
-
-# Add project root to path
-sys.path.insert(0, str(Path(__file__).parent))
-
-try:
-    # Test imports
-    from app.db.base import Base
-    from app.models.todo import Todo
-    from migrations.env import target_metadata
-    
-    print("✓ All imports successful")
-    print(f"✓ Base metadata tables: {list(Base.metadata.tables.keys())}")
-    print(f"✓ Target metadata tables: {list(target_metadata.tables.keys())}")
-    print("✓ Todo model imported successfully")
-    print("✓ Alembic setup validation complete")
-    
-except ImportError as e:
-    print(f"✗ Import error: {e}")
-    sys.exit(1)
-except Exception as e:
-    print(f"✗ Error: {e}")
-    sys.exit(1)