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zipit/projekti_clean/prompts/1_data_models.py.md

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+# 1 — Data Engineer (data) — models.py
+
+**Malli:** `qwen-coder`
+
+## System Prompt
+
+```
+You are a database architect specializing in SQLAlchemy and relational databases.
+
+YOUR RESPONSIBILITIES:
+1. Design normalized database schemas with proper column types and constraints
+2. Define SQLAlchemy models with __tablename__, primary keys, indexes, and relationships
+3. Set up engine, SessionLocal, and Base in the same file (models.py or database.py)
+4. Use String(length) not bare String for SQLite compatibility
+5. Add nullable=False for required fields, unique=True where appropriate
+6. Use Column(Integer, primary_key=True, index=True) for IDs
+
+ALWAYS INCLUDE:
+- from sqlalchemy import create_engine, Column, Integer, String
+- from sqlalchemy.ext.declarative import declarative_base
+- from sqlalchemy.orm import sessionmaker
+- DATABASE_URL, engine, SessionLocal, Base
+```
+
+## Syöte
+
+```
+You are a database architect specializing in SQLAlchemy and relational databases.
+
+YOUR RESPONSIBILITIES:
+1. Design normalized database schemas with proper column types and constraints
+2. Define SQLAlchemy models with __tablename__, primary keys, indexes, and relationships
+3. Set up engine, SessionLocal, and Base in the same file (models.py or database.py)
+4. Use String(length) not bare String for SQLite compatibility
+5. Add nullable=False for required fields, unique=True where appropriate
+6. Use Column(Integer, primary_key=True, index=True) for IDs
+
+ALWAYS INCLUDE:
+- from sqlalchemy import create_engine, Column, Integer, String
+- from sqlalchemy.ext.declarative import declarative_base
+- from sqlalchemy.orm import sessionmaker
+- DATABASE_URL, engine, SessionLocal, Base
+
+EXAMPLE of models.py (for a different project, adapt to this one):
+```
+from sqlalchemy import create_engine, Column, Integer, String
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+
+DATABASE_URL = "sqlite:///./app.db"
+engine = create_engine(DATABASE_URL, connect_args={"check_same_thread": False})
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+Base = declarative_base()
+
+class Item(Base):
+    __tablename__ = "items"
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String(100), nullable=False)
+    description = Column(String(500))
+```
+
+PROJECT REQUIREMENTS (from product owner):
+1. **PROJECT NAME:** Todo-sovellus
+
+2. **GOAL:** A simple task manager for individuals to keep track of their daily tasks and manage them efficiently.
+
+3. **CORE FEATURES:**
+   - Create new todos with title, description, due date.
+   - Read/View all todos or a single todo by ID.
+   - Update existing todos (title, description, status).
+   - Delete completed or unnecessary todos.
+   - Filter todos by status (e.g., pending, completed).
+
+4. **DATA MODEL:**
+   - Todo
+     - id (integer, primary key)
+     - title (string)
+     - description (text)
+     - due_date (date)
+     - status (enum: 'pending', 'completed')
+
+5. **API ENDPOINTS:**
+   - GET /todos: Retrieve all todos.
+   - GET /todos/{id}: Retrieve a single todo by ID.
+   - POST /todos: Create a new todo.
+   - PUT /todos/{id}: Update an existing todo.
+   - DELETE /todos/{id}: Delete a todo.
+
+6. **CONSTRAINTS:**
+   - Must use SQLite as the database.
+   - No authentication required for accessing endpoints.
+   - Implement unit tests and integration tests to ensure functionality.
+
+NOW write "models.py" for THIS project: Todo-sovellus FastAPI + SQLite, CRUD-endpointit ja testit
+Define the SQLAlchemy model based on the project description. Always include:
+- engine with check_same_thread=False for SQLite
+- SessionLocal with autocommit=False
+- Base = declarative_base()
+- Model class with __tablename__, primary key, and fields
+Adapt to the project requirements. Import from already written files. Write ONLY the code, no explanations.
+```
+
+## Tulos
+
+```
+from sqlalchemy import create_engine, Column, Integer, String, Date, Enum
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+
+DATABASE_URL = "sqlite:///./todo.db"
+engine = create_engine(DATABASE_URL, connect_args={"check_same_thread": False})
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+Base = declarative_base()
+
+class Todo(Base):
+    __tablename__ = "todos"
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String(100), nullable=False)
+    description = Column(String(500))
+    due_date = Column(Date, nullable=False)
+    status = Column(Enum('pending', 'completed'), default='pending')
+```