Oleksii Sholik

Add two new configuration options for periodic retained WAL size check in scaled down mode

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Closes https://github.com/electric-sql/electric/issues/3260. This PR is missing the query for WAL size but the surrounding logic is ready for review. I'll implement the query in a follow-up PR because I want...

Currently all polling-based metrics are driven by a global `telemetry_poller` process running under `ApplicationTelemetry` and stack-specific ones running under each live `StackSupervisor`. Therefore they are all sampled at the same...

[`persistent_term`](https://www.erlang.org/doc/apps/erts/persistent_term.html) is a specialized hash table inside BEAM VM that is optimize for reading: looking up values by key doesn't involve any copying and is an O(1) operation. That read...

Just to avoid Electric going to sleep forever, we should have it wake up periodically and make sure there's no pathological WAL buildup over time. This can be implemented as...

Electric incorrectly treats failure to establish unencrypted DB connection an unkown error

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Start Electric with `sslmode=disable` in `DATABASE_URL` while connecting to a database that enforces the use of SSL. You'll see the following errors logged: ``` 16:16:57.491 pid= [debug] Opening lock connection...

The error message should mention which type or which operation is not supported to help the user self-diagnose.

Electric has indexes for the equality op (`WHERE = `) and array inclusion op (`WHERE @> `). Electric could use an index implementation that would speed up `LIKE` and `ILIKE`...