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backend/app/__init__.py

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+# Backend package for the Clinica Veterinaria Formiginese project.

backend/app/api/__init__.py

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+# API routers package.

backend/app/api/health.py

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+from fastapi import APIRouter, Depends
+from sqlalchemy import text
+from sqlalchemy.orm import Session
+
+from app.config import settings
+from app.db.session import get_db
+
+
+router = APIRouter(prefix="/api", tags=["health"])
+
+
+@router.get("/health")
+def healthcheck() -> dict[str, str]:
+    return {
+        "status": "ok",
+        "environment": settings.app_env,
+        "app_name": settings.app_name,
+    }
+
+
+@router.get("/db-health")
+def database_healthcheck(db: Session = Depends(get_db)) -> dict[str, str | int]:
+    result = db.execute(text("SELECT 1")).scalar_one()
+    return {
+        "status": "ok",
+        "database": "connected",
+        "result": result,
+        "sqlite_file": settings.sqlite_file_path or "not-applicable",
+    }

backend/app/config.py

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+from pathlib import Path
+import os
+
+from dotenv import load_dotenv
+
+
+BASE_DIR = Path(__file__).resolve().parent.parent
+PROJECT_ROOT = BASE_DIR.parent
+ENV_FILE = PROJECT_ROOT / ".env"
+
+load_dotenv(ENV_FILE)
+
+
+class Settings:
+    def __init__(self) -> None:
+        self.app_name = os.getenv("APP_NAME", "Clinica Veterinaria Formiginese API")
+        self.app_env = os.getenv("APP_ENV", "development")
+        self.app_host = os.getenv("APP_HOST", "127.0.0.1")
+        self.app_port = int(os.getenv("APP_PORT", "8000"))
+        default_sqlite_path = (PROJECT_ROOT / "data" / "clinica.db").resolve()
+        self.database_url = os.getenv("DATABASE_URL", f"sqlite:///{default_sqlite_path.as_posix()}")
+
+    @property
+    def sqlite_file_path(self) -> str | None:
+        sqlite_prefix = "sqlite:///"
+        if self.database_url.startswith(sqlite_prefix):
+            return self.database_url.removeprefix(sqlite_prefix)
+        return None
+
+
+settings = Settings()

backend/app/db/__init__.py

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+# Database package.

backend/app/db/base.py

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+from sqlalchemy.orm import DeclarativeBase
+
+
+class Base(DeclarativeBase):
+    pass

backend/app/db/init_db.py

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+import hashlib
+
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from app.db.base import Base
+from app.db.session import SessionLocal, engine
+from app.models import TestUser
+
+
+def init_db() -> None:
+    Base.metadata.create_all(bind=engine)
+    seed_test_data()
+
+
+def seed_test_data() -> None:
+    with SessionLocal() as db:
+        existing_user = db.scalar(select(TestUser).where(TestUser.username == "admin_test"))
+        if existing_user:
+            return
+
+        password_hash = hashlib.sha256("change_me_123".encode("utf-8")).hexdigest()
+        db.add(TestUser(username="admin_test", password_hash=password_hash))
+        db.commit()

backend/app/db/session.py

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+from collections.abc import Generator
+from pathlib import Path
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import Session, sessionmaker
+
+from app.config import settings
+
+if settings.sqlite_file_path:
+    Path(settings.sqlite_file_path).parent.mkdir(parents=True, exist_ok=True)
+
+engine = create_engine(
+    settings.database_url,
+    connect_args={"check_same_thread": False} if settings.database_url.startswith("sqlite") else {},
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+def get_db() -> Generator[Session, None, None]:
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()

backend/app/main.py

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+from fastapi import FastAPI
+
+from app.api.health import router as health_router
+from app.config import settings
+from app.db.init_db import init_db
+
+
+init_db()
+
+app = FastAPI(title=settings.app_name)
+app.include_router(health_router)

backend/app/models/__init__.py

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+from app.models.test_user import TestUser
+
+__all__ = ["TestUser"]

backend/app/models/test_user.py

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+from sqlalchemy import String
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.db.base import Base
+
+
+class TestUser(Base):
+    __tablename__ = "test_users"
+
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    username: Mapped[str] = mapped_column(String(50), unique=True, nullable=False, index=True)
+    password_hash: Mapped[str] = mapped_column(String(128), nullable=False)

backend/app/repositories/__init__.py

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+# Data access layer package.

backend/app/schemas/__init__.py

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+# Pydantic schemas package.

backend/app/services/__init__.py

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+# Business services package.