Adding postgres support to ombi

[dben]

I saw the feature suggestion at https://features.ombi.io/suggestions/127609/add-postgresql-as-a-database-provider and thought It would be nice and quick to implement, as the *arrs all have postgres support but not mySql support built in.

This should be pretty straightforward - I added NpgSql and generated the migrations for it, then updated DatabaseExtensions.cs.

I've also built a docker image that includes this, based on the LinuxServer Ombi container at ghcr.io/dben/ombi:latest.

In my personal testing deploying the image in my nomad cluster, this appears to work identically to the mysql provider, at least for my setup (plex/radarr/sonarr/email notifications). Since it's just EF I woudn't expect too much divergence.

[dben]

After further testing, I made a few updates:

1. Fixed an issue where Npgsql was more strict than the app in timezone comparison, causing some failed inserts
2. Since Ombi has a few places where it uses raw SQL queries, I switched the postgres tables to be case-insensitive by converting identifiers to lowercase in the postgres migrations. This lets us avoid needing quotes for everything too.
3. I noticed a few unit tests were failng from midnght UTC to about 2-4 am UTC - I switched the addHours calls to addMinutes so there's only a down time of a few minutes instead.

[teambvd]

Just chiming in to note, I've been testing this for ~5 weeks now, all without issue - going through the request history, it looks like users requested 11 series and 14 movies in that time (normal usage).

In an attempt to 'stress' the app, I'd added 4 multi-season TV series (~430 episodes combined) along with 8 movies, all in rapid succession; all went without a hitch, and was still more performant than adding a single series with the sqlite DB, at least to my eyes! 😮

Great work @dben !

[dben]

Thanks for the testing - I've been running this PR as well on my personal instance since December, and haven't had any issues, although I've only had about a half dozen new movies and seven shortish tv shows added during that time.

[0xFEEDC0DE64]

could you provide a working example for database.json, it will also be easier to update the docs later based on this

[dben]

could you provide a working example for database.json, it will also be easier to update the docs later based on this

sure, here's what I use (with the passwords redacted) - you can use separate databases too, but they all work lumped together:

{
    "OmbiDatabase": {
        "Type": "Postgres",
        "ConnectionString": "Host=127.0.0.1;Port=5432;Database=ombi;Username=postgres;Password=password"
    },
    "SettingsDatabase": {
        "Type": "Postgres",
        "ConnectionString": "Host=127.0.0.1;Port=5432;Database=ombi;Username=postgres;Password=password"
    },
    "ExternalDatabase": {
        "Type": "Postgres",
        "ConnectionString": "Host=127.0.0.1;Port=5432;Database=ombi;Username=postgres;Password=password"
}