Initial commit

backend/app/db/__init__.py

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+

backend/app/db/session.py

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+from __future__ import annotations
+
+from functools import lru_cache
+
+from sqlalchemy import create_engine, text
+from sqlalchemy.orm import Session, sessionmaker
+
+from app.core.config import get_settings
+
+
+@lru_cache
+def get_engine():
+    settings = get_settings()
+    return create_engine(
+        settings.mysql_dsn,
+        pool_pre_ping=True,
+        future=True,
+    )
+
+
+SessionLocal = sessionmaker(bind=get_engine(), autoflush=False, autocommit=False, future=True)
+
+
+def get_db() -> Session:
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+def check_database_health() -> dict[str, object]:
+    settings = get_settings()
+    with get_engine().connect() as conn:
+        current_db = conn.execute(text("SELECT DATABASE()")).scalar()
+        version = conn.execute(text("SELECT VERSION()")).scalar()
+        table_count = conn.execute(
+            text(
+                """
+                SELECT COUNT(*)
+                FROM information_schema.tables
+                WHERE table_schema = :schema_name
+                """
+            ),
+            {"schema_name": settings.mysql_database},
+        ).scalar()
+    return {
+        "connected": True,
+        "database": current_db,
+        "version": version,
+        "table_count": int(table_count or 0),
+    }
+