Ignore paths that begin with underscore

[nytamin]

The problem:

I continously get a LOT of error messages in the log, on the form Only reserved document ids may start with underscore..

{"level":50,"time":1705906640456,"pid":25528,"hostname":"NYTAMIN-STATION4","name":"scanner","err":{"type":"PouchError","message":"Only reserved document ids may start with underscore.","st
ack":"Error\n    at new CustomPouchError (C:\\git\\media-scanner\\node_modules\\pouchdb-node\\lib\\index.js:656:21)\n    at createError (C:\\git\\media-scanner\\node_modules\\pouchdb-node\
\lib\\index.js:665:10)\n    at invalidIdError (C:\\git\\media-scanner\\node_modules\\pouchdb-node\\lib\\index.js:794:11)\n    at PouchDB.<anonymous> (C:\\git\\media-scanner\\node_modules\\
pouchdb-node\\lib\\index.js:1754:3)\n    at PouchDB.<anonymous> (C:\\git\\media-scanner\\node_modules\\pouchdb-node\\lib\\index.js:290:21)\n    at PouchDB.<anonymous> (C:\\git\\media-scann
er\\node_modules\\argsarray\\index.js:14:18)\n    at C:\\git\\media-scanner\\node_modules\\pouchdb-node\\lib\\index.js:229:21\n    at new Promise (<anonymous>)\n    at PouchDB.<anonymous>
(C:\\git\\media-scanner\\node_modules\\pouchdb-node\\lib\\index.js:216:19)\n    at PouchDB.put (C:\\git\\media-scanner\\node_modules\\argsarray\\index.js:14:18)","status":400,"name":"bad_r
equest","error":true},"msg":"Only reserved document ids may start with underscore."}

Because I have a folder structure with folders that begin with underscore: /media/_oldClips/clip.mp4

The fix

A simple quick fix:
Ignore any ids that begin with underscore, since they cannot be stored in PouchDB anyway, so this should result in no changes in the data written to the DB.

Caveat

This works for me, since I mark folders with underscore in order to ignore them anyway.

But if anyone in the future wishes to scan folders with names that begin with underscore, we could instead change how we generate the ID into a hash (but that's for a later PR).

[Julusian]

I was wondering about this being a breaking change, but as it fails to save them I agree that this is a minor fix.

we could instead change how we generate the ID into a hash

tbh, I want to replace pouchdb at some point anyway, which could end up fixing this in another way #72