feat(admin): finalizing modular refactoring with testing suite and UI polish

backend/routers/admin/backups.py

@@ -0,0 +1,91 @@
+from fastapi import APIRouter, Depends, HTTPException, UploadFile, File
+from sqlalchemy.orm import Session
+from typing import List
+from fastapi.responses import FileResponse
+from ... import schemas, auth, models
+from ...database import get_db
+from ...db_manager import DbManager
+
+router = APIRouter(
+    prefix="/admin/db",
+    tags=["Admin Database Backups"]
+)
+
+@router.get("/backups", response_model=List[schemas.BackupInfo])
+def get_backups(
+    db: Session = Depends(get_db),
+    current_admin: auth.TokenData = Depends(auth.get_current_admin)
+):
+    """List available database backups."""
+    return DbManager.get_backup_list()
+
+@router.get("/stats", response_model=schemas.DatabaseStats)
+def get_db_stats(
+    db: Session = Depends(get_db),
+    current_admin: auth.TokenData = Depends(auth.get_current_admin)
+):
+    """Get database backup storage statistics."""
+    return DbManager.get_stats()
+
+@router.post("/backup", response_model=schemas.BackupInfo)
+def trigger_manual_backup(
+    db: Session = Depends(get_db),
+    current_admin: auth.TokenData = Depends(auth.get_current_admin)
+):
+    """Trigger a manual database backup."""
+    filename = DbManager.create_backup(db, label="manual", user_id=current_admin.sub)
+    backups = DbManager.get_backup_list()
+    for b in backups:
+        if b.filename == filename:
+            return b
+    raise HTTPException(status_code=500, detail="Backup created but info not found")
+
+@router.post("/restore")
+def restore_database(
+    payload: dict,
+    db: Session = Depends(get_db),
+    current_admin: auth.TokenData = Depends(auth.get_current_admin)
+):
+    """Restore database from a specific file. DANGEROUS."""
+    filename = payload.get("filename")
+    confirm = payload.get("confirm", False)
+    
+    if not filename:
+        raise HTTPException(status_code=400, detail="Filename required")
+    if not confirm:
+        raise HTTPException(status_code=400, detail="Confirmation required")
+        
+    try:
+        DbManager.restore_backup(filename, db, user_id=current_admin.sub)
+        return {"status": "success", "message": f"Database restored from {filename}"}
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))
+
+@router.get("/export")
+def export_database(
+    current_admin: auth.TokenData = Depends(auth.get_current_admin)
+):
+    """Download the current database file."""
+    try:
+        path = DbManager.export_db()
+        return FileResponse(
+            path, 
+            media_type="application/x-sqlite3", 
+            filename="inventory_export.db"
+        )
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))
+
+@router.post("/import")
+async def import_database(
+    file: UploadFile = File(...),
+    db: Session = Depends(get_db),
+    current_admin: auth.TokenData = Depends(auth.get_current_admin)
+):
+    """Upload and replace the current database. DANGEROUS."""
+    contents = await file.read()
+    try:
+        DbManager.import_db(contents, db, user_id=current_admin.sub)
+        return {"status": "success", "message": "Database successfully imported and replaced."}
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))