Multiple face add

Try add face in loop for files in my folder(6000 faces)
i got error **FATAL: sorry, too many clients already**
but api response is ok
`compreface-core | {"severity": "DEBUG", "message": "Found: BoundingBoxDTO(x_min=30, y_min=46, x_max=122, y_max=152, probability=0.9968504309654236, _np_landmarks=array([[ 59, 91],\n [ 91, 90],\n [ 75, 112],\n [ 63, 125],\n [ 89, 124]]))", "request": {"method": "POST", "path": "/find_faces", "filename": "6af6425dafe57fd88148a0b7d6f14d5c19771001.jpg", "api_key": "", "remote_addr": "172.25.0.4"}, "logger": "src.services.facescan.plugins.facenet.facenet", "module": "facenet", "traceback": null, "build_version": "dev"}
compreface-core | {"severity": "INFO", "message": "200 OK", "request": {"method": "POST", "path": "/find_faces", "filename": "6af6425dafe57fd88148a0b7d6f14d5c19771001.jpg", "api_key": "", "remote_addr": "172.25.0.4"}, "logger": "src.services.flask_.log_response", "module": "log_response", "traceback": null, "build_version": "dev"}
compreface-postgres-db | 2021-09-15 05:47:10.758 UTC [145] FATAL: sorry, too many clients already
compreface-api | 2021-09-15 05:47:10.758 ERROR 7 --- [nio-8080-exec-7] c.e.f.c.t.s.NotificationSenderService : Connection Error: sorry, too many clients already
compreface-ui | 192.168.101.111 - - [15/Sep/2021:05:47:10 +0000] "POST /api/v1/recognition/faces?subject=makarskayato%20%D0%9F%D1%80%D0%B8%D0%B5%D0%BC%D1%89%D0%B8%D0%BA%20%D0%B7%D0%B0%D0%BA%D0%B0%D0%B7%D0%BE%D0%B2 HTTP`

まず、POST /api/v1/recognition/faces を介して顔を追加する報告されたループを再現し、付随する compreface-postgres-db と NotificationSenderService のエラーを調査します。繰り返しのリクエストがデータベース接続をどのように使用するかを追跡します。完了の条件は、大量の顔追加によって PostgreSQL クライアントが枯渇せず、失敗が一貫して報告されることです。

索引モデルが issue の本文から書いたものです。