refactor: split admin/config.py into ai_config and db_config

backend/routers/admin/db_config.py

@@ -0,0 +1,52 @@
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+from ... import models, schemas, auth
+from ...database import get_db
+from ...scheduler import sync_scheduler_config
+
+router = APIRouter(
+    prefix="/admin/db",
+    tags=["Admin Configuration"]
+)
+
+
+@router.get("/settings", response_model=schemas.DbSettingsUpdate)
+def get_db_settings(
+    db: Session = Depends(get_db),
+    current_admin: auth.TokenData = Depends(auth.get_current_admin)
+):
+    """Get database retention and scheduling settings."""
+    retention = db.query(models.SystemSetting).filter(models.SystemSetting.key == "backup_retention_count").first()
+    hour = db.query(models.SystemSetting).filter(models.SystemSetting.key == "backup_schedule_hour").first()
+    freq = db.query(models.SystemSetting).filter(models.SystemSetting.key == "backup_schedule_freq_days").first()
+
+    return {
+        "retention_count": int(retention.value) if retention else 10,
+        "schedule_hour": int(hour.value) if hour else 3,
+        "schedule_freq_days": int(freq.value) if freq else 1
+    }
+
+
+@router.patch("/settings", response_model=schemas.DbSettingsUpdate)
+def update_db_settings(
+    settings: schemas.DbSettingsUpdate,
+    db: Session = Depends(get_db),
+    current_admin: auth.TokenData = Depends(auth.get_current_admin)
+):
+    """Update database settings and re-trigger scheduler sync."""
+    pairs = {
+        "backup_retention_count": str(settings.retention_count),
+        "backup_schedule_hour": str(settings.schedule_hour),
+        "backup_schedule_freq_days": str(settings.schedule_freq_days)
+    }
+
+    for key, val in pairs.items():
+        existing = db.query(models.SystemSetting).filter(models.SystemSetting.key == key).first()
+        if existing:
+            existing.value = val
+        else:
+            db.add(models.SystemSetting(key=key, value=val))
+
+    db.commit()
+    sync_scheduler_config()
+    return settings