Fix setting pg_trgm.similarity_threshold on new connection

[raymondjacobson]

Trello Card Link

https://trello.com/c/B8dTGjQO/1706-determine-why-some-search-results-in-api-are-not-returning-successfully-https-discoveryprovideraudiusco-v1-tracks-searchquery3la

Description

Sets (resets) pg_trgm.similarity_threshold every time the session manager engine creates a new connection. The setting persists across connections (which I had misunderstood before). Once set on the connection, any session that uses the connection will have the setting.

Services

• Discovery Provider

Does it touch a critical flow like Discovery indexing, Creator Node track upload, Creator Node gateway, or Creator Node file system?

Delete an option.

• ✅ Nope

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide repro instructions & any configuration.
Include log analysis if applicable.

Repro of bug (before change)

1. Ran local discovery provider pointed at a db clone.
2. Updated connection pool timeout to be 60s (instead of 3600s) and pool count to 2.
3. Added a log statement to query + SHOW pg_trgm.similarity_threshold every time the search endpoint would hit.
4. Successfully ran one search query for 3lau+touch+carly+paige
5. Waited 60s
6. Reran search query for 3lau+touch+carly+paige and saw error message that pg_trgm.similarity_threshold was unset

Rolled out this code change & repeated 1-5 and #6 returned successfully

[dmanjunath]

Thanks for adding comments