fixed db download

modules/routes/routeAdminDatabaseHealth.py

@@ -377,16 +377,38 @@ async def postMigrationImport(
 # Per-DB endpoints (progress-friendly)
 # ---------------------------------------------------------------------------
 
+_pendingExports: Dict[str, dict] = {}
+
+
+@router.post("/migration/export-start")
+@limiter.limit("10/minute")
+def postMigrationExportStart(
+    request: Request,
+    currentUser: User = Depends(requireSysAdmin),
+) -> Dict[str, Any]:
+    """Start an export session. Returns a token for subsequent per-DB calls."""
+    import uuid
+    token = str(uuid.uuid4())
+    _pendingExports[token] = {"databases": {}}
+    logger.info("SysAdmin migration export-start: user=%s token=%s", currentUser.username, token)
+    return {"token": token}
+
+
 @router.get("/migration/export-single")
 @limiter.limit("60/minute")
 def getMigrationExportSingle(
     request: Request,
+    token: str,
     database: str,
     currentUser: User = Depends(requireSysAdmin),
 ) -> Dict[str, Any]:
-    """Export a single database as JSON (used by the frontend for per-DB progress)."""
+    """Export a single database and store it server-side. Returns only metadata."""
     from modules.shared.dbRegistry import getRegisteredDatabases
 
+    pending = _pendingExports.get(token)
+    if not pending:
+        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Invalid export token.")
+
     if database not in getRegisteredDatabases():
         raise HTTPException(
             status_code=status.HTTP_400_BAD_REQUEST,
@@ -404,7 +426,57 @@ def getMigrationExportSingle(
             detail=f"Export failed for '{database}': {e}",
         ) from e
 
-    return {"database": database, "data": dbPayload}
+    pending["databases"][database] = dbPayload
+    logger.info("SysAdmin migration export-single done: user=%s db=%s tables=%s records=%s",
+                currentUser.username, database, dbPayload.get("tableCount", 0), dbPayload.get("totalRecords", 0))
+
+    return {
+        "database": database,
+        "tableCount": dbPayload.get("tableCount", 0),
+        "totalRecords": dbPayload.get("totalRecords", 0),
+    }
+
+
+@router.get("/migration/export-download")
+@limiter.limit("5/minute")
+def getMigrationExportDownload(
+    request: Request,
+    token: str,
+    filename: str = "backup.json",
+    currentUser: User = Depends(requireSysAdmin),
+) -> StreamingResponse:
+    """Assemble and stream the final export file from server-side data."""
+    from datetime import datetime, timezone
+
+    pending = _pendingExports.pop(token, None)
+    if not pending or not pending.get("databases"):
+        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Invalid or expired export token.")
+
+    databases = pending["databases"]
+    totalTables = sum(d.get("tableCount", 0) for d in databases.values())
+    totalRecords = sum(d.get("totalRecords", 0) for d in databases.values())
+
+    exportData = {
+        "meta": {
+            "exportedAt": datetime.now(timezone.utc).isoformat(),
+            "version": "1.0",
+            "databaseCount": len(databases),
+            "totalTables": totalTables,
+            "totalRecords": totalRecords,
+        },
+        "databases": databases,
+    }
+
+    logger.info("SysAdmin migration export-download: user=%s dbs=%s tables=%s records=%s",
+                currentUser.username, len(databases), totalTables, totalRecords)
+
+    content = json.dumps(exportData, ensure_ascii=False, default=str)
+
+    return StreamingResponse(
+        iter([content]),
+        media_type="application/json",
+        headers={"Content-Disposition": f'attachment; filename="{filename}"'},
+    )
 
 
 @router.post("/migration/prepare-import")