Set up basic FastAPI project structure for todo app

- Created main.py with FastAPI app, CORS configuration, and basic endpoints
- Added requirements.txt with necessary dependencies
- Set up app directory structure with proper organization
- Implemented base URL endpoint with app info and documentation links
- Added health check endpoint that reports application and database status
- Configured CORS to allow all origins
- Set up Alembic for database migrations with proper SQLite configuration
- Updated README with comprehensive project documentation

README.md

@@ -1,3 +1,79 @@
-# FastAPI Application
+# Todo App API
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A simple Todo application API built with FastAPI and SQLite.
+
+## Features
+
+- FastAPI web framework
+- SQLite database with SQLAlchemy ORM
+- Alembic database migrations
+- CORS enabled for all origins
+- Health check endpoint
+- Interactive API documentation
+
+## Project Structure
+
+```
+todoapp-ns86xt/
+├── main.py                 # FastAPI application entry point
+├── requirements.txt        # Python dependencies
+├── alembic.ini            # Alembic configuration
+├── alembic/               # Database migration files
+│   ├── env.py
+│   ├── script.py.mako
+│   └── versions/
+├── app/                   # Application modules
+│   ├── db/               # Database configuration
+│   │   ├── base.py       # SQLAlchemy Base
+│   │   └── session.py    # Database session management
+│   ├── models/           # SQLAlchemy models
+│   └── api/              # API endpoints
+└── storage/              # Application storage directory
+    └── db/               # SQLite database files
+```
+
+## Installation
+
+1. Install dependencies:
+```bash
+pip install -r requirements.txt
+```
+
+## Running the Application
+
+Start the development server:
+```bash
+uvicorn main:app --reload --host 0.0.0.0 --port 8000
+```
+
+The application will be available at:
+- API: http://localhost:8000
+- Interactive API docs (Swagger): http://localhost:8000/docs
+- Alternative API docs (ReDoc): http://localhost:8000/redoc
+- OpenAPI JSON: http://localhost:8000/openapi.json
+
+## API Endpoints
+
+- `GET /` - Root endpoint with application information
+- `GET /health` - Health check endpoint
+- `GET /docs` - Interactive API documentation (Swagger UI)
+- `GET /redoc` - Alternative API documentation (ReDoc)
+
+## Database
+
+The application uses SQLite database stored at `/app/storage/db/db.sqlite`. Database migrations are managed with Alembic.
+
+## Environment Variables
+
+Currently, no environment variables are required for basic operation.
+
+## Development
+
+The project uses Ruff for code linting and formatting. Make sure to run linting before committing changes.
+
+## Health Check
+
+The `/health` endpoint provides information about:
+- Application status
+- Database connectivity
+- Service version

alembic.ini

@@ -0,0 +1,101 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = migrations
+
+# template used to generate migration file names; The default value is %%(rev)s_%%(slug)s
+# Uncomment the line below if you want the files to be prepended with date and time
+# file_template = %%(year)d_%%(month).2d_%%(day).2d_%%(hour).2d%%(minute).2d-%%(rev)s_%%(slug)s
+
+# sys.path path, will be prepended to sys.path if present.
+# defaults to the current working directory.
+prepend_sys_path = .
+
+# timezone to use when rendering the date within the migration file
+# as well as the filename.
+# If specified, requires the python-dateutil library that can be
+# installed by adding `alembic[tz]` to the pip requirements
+# string value is passed to dateutil.tz.gettz()
+# leave blank for localtime
+# timezone =
+
+# max length of characters to apply to the
+# "slug" field
+# truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+# version number format
+version_num_format = %04d
+
+# version path separator; As mentioned above, this is the character used to split
+# version_locations. The default within new alembic.ini files is "os", which uses
+# os.pathsep. If this key is omitted entirely, it falls back to the legacy
+# behavior of splitting on spaces and/or commas.
+# Valid values for version_path_separator are:
+#
+# version_path_separator = :
+# version_path_separator = ;
+# version_path_separator = space
+version_path_separator = os
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+sqlalchemy.url = sqlite:////app/storage/db/db.sqlite
+
+
+[post_write_hooks]
+# post_write_hooks defines scripts or Python functions that are run
+# on newly generated revision scripts.  See the documentation for further
+# detail and examples
+
+# format using "black" - use the console_scripts runner, against the "black" entrypoint
+# hooks = black
+# black.type = console_scripts
+# black.entrypoint = black
+# black.options = -l 79 REVISION_SCRIPT_FILENAME
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

alembic/env.py

@@ -0,0 +1,81 @@
+from logging.config import fileConfig
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+from alembic import context
+import sys
+import os
+
+# Add the project root to the Python path
+sys.path.append(os.path.dirname(os.path.dirname(__file__)))
+
+from app.db.base import Base
+
+# 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()

alembic/script.py.mako

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

app/__init__.py

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

app/api/__init__.py

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

app/api/api.py

@@ -1,6 +1,7 @@
 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()
 

app/db/__init__.py

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

app/models/__init__.py

@@ -0,0 +1,4 @@
+# Models package
+from .todo import Todo
+
+__all__ = ["Todo"]

app/schemas/__init__.py

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

main.py

@@ -3,7 +3,7 @@ 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
-import os
+from app.api.api import api_router
 
 # Create database tables
 Base.metadata.create_all(bind=engine)
@@ -27,6 +27,9 @@ app.add_middleware(
     allow_headers=["*"],
 )
 
+# Include API routes
+app.include_router(api_router, prefix="/api/v1")
+
 
 @app.get("/")
 async def root():

migrations/__init__.py

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

migrations/env.py

@@ -0,0 +1,86 @@
+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

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

@@ -0,0 +1,39 @@
+"""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

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

validate_setup.py

@@ -0,0 +1,28 @@
+#!/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)