BUG FIX: The endpoint routing logic was inside the loop that
processes all GraphQL definitions. This caused mutations to be incorrectly
routed to read-only endpoints when followed by other definitions (queries,
fragments, etc).
The bug manifested as: mutations → read-only Hasura → read-only pooler →
PostgreSQL replica → "cannot set transaction read-write mode during recovery"
Changes:
- Move endpoint routing logic AFTER the definition processing loop
- Ensures mutations are ALWAYS routed to write endpoint regardless of
subsequent definitions in the document
- Add 3 comprehensive regression tests covering:
1. Mutation with multiple operations
2. Mutation followed by fragment
3. Complex main-bot style mutation document
Tests: All pass including new regression tests
Impact: Fixes database write failures in main-bot and other services
* This change introduces ability to set additional endpoint leading to the
instance of the graphql server connected to the read only database.
If regular query is detected and endpoint for `HOST_GRAPHQL_READONLY` value is set,
the query will be proxied to it. Mutations and non-graphql will be sent
to the `HOST_GRAPHQL` endpoint.
lukaszraczylo