Python program to process files

I need a piece of software in Python 3.
It resides on a home server on Linux OS (Debian).
It is a routine that runs periodically.
The period is read from a flat conf file.
It reads a MariaDB table of filepaths on the same server and compares to the file system (fs)

It processes new files
The processes include
documents
indexing text documents in various formats
metadata from documents that have it
inverse indexing is fairly rudimentary, but robust, details to follow

images
face detection
object detection and recognition
EXIF data extraction

audio
speech to text (STT) transcription of voice notes with DeepSpeech model on the server
index the transcription as for documents
STT must be local not using a remote API, this is critical, the model is in place already

video
transcoding of certain video files to a new format
face detection
object recognition
EXIF data extraction if present

The program may run as a server watch program - watching user directories for new files, or run periodically.
It will run as a daemon and be started and stopped with systemd
it will not run as a cronjob
The program updates a MariaDB database for the output of the processing.
It is part of an project which will be open-source in the future, I'm paying for some aspects myself for the time being.
It will compile as python 3, not python 2, unless they are interoperable.

Expected timeframe is 3 weeks. 10 days to first testing, 10 days to test and debug.
Expected hours of work in the timeframe - 25 hours.

there is a detailed job spec which can be provided when we get into more detail