Directly read from the Tiamat database

[culka]

• Use the default database also as the metadata database
• Create a direct connection to the Tiamat database
• Track all public tables
• Track all relevant parent -> child connections

Resolves HSLdevcom/jore4#1673

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This change is 

[Leitsi]

Reviewed 3 of 102 files at r1.
Reviewable status: 3 of 102 files reviewed, 2 unresolved discussions (waiting on @culka)

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metadata/hsl/databases/databases.yaml line 7 at r1 (raw file):

      database_url:
        from_env: HASURA_TIAMAT_DATABASE_URL
      isolation_level: read-committed

Other connections have isolation\_level: serializable, any special reason for not using that?

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metadata/hsl/databases/databases.yaml line 12 at r1 (raw file):

    naming_convention: hasura-default
    root_fields:
      namespace: stop_database

In other databases we have used plural (which would sound better anyway, in my opinion, because it sounds a bit less like a verb), so should we use stops_database here? Also, the folder name tiamatdb does not match this, is that fine?

Also database -> db would be an acceptable abbreviation I think, but this is fine as well.

[Leitsi]

Reviewable status: 3 of 102 files reviewed, 3 unresolved discussions (waiting on @culka)

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migrations/generic/metadata/readme.txt line 1 at r1 (raw file):

Otherwise empty folder expected.

Could elaborate a little, if the purpose of these files is to ensure that the folder exists (for whatever reason).

[culka]

Reviewed 7 of 102 files at r1.
Reviewable status: 7 of 102 files reviewed, 3 unresolved discussions (waiting on @Leitsi)

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metadata/hsl/databases/databases.yaml line 7 at r1 (raw file):

Previously, Leitsi (Tommi Leinamo) wrote…

Other connections have isolation\_level: serializable, any special reason for not using that?

No real reason, this should not have any effects because writes are impossible, but let's use the same one.

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metadata/hsl/databases/databases.yaml line 12 at r1 (raw file):

Previously, Leitsi (Tommi Leinamo) wrote…

In other databases we have used plural (which would sound better anyway, in my opinion, because it sounds a bit less like a verb), so should we use stops_database here? Also, the folder name tiamatdb does not match this, is that fine?

Also database -> db would be an acceptable abbreviation I think, but this is fine as well.

Changed database to stops_database
Also yeah, tiamatdb should rather be stops, changed 👍

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migrations/generic/metadata/readme.txt line 1 at r1 (raw file):

Previously, Leitsi (Tommi Leinamo) wrote…

Could elaborate a little, if the purpose of these files is to ensure that the folder exists (for whatever reason).

Added a better description.

[Leitsi]

Reviewable status: 3 of 104 files reviewed, all discussions resolved (waiting on @culka)