[gql] Watermark task reads from watermarks table, use watermarks for `Event::paginate`#21176

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wlmyng wants to merge 3 commits intomainfrom gql-anchor-on-watermarks

+434-63

Commits on Feb 14, 2025

Watermark task now reads from watermarks table instead of checkpoints table. This is used for Event::paginate, so we can correctly bound the available range of data
wlmyng
committed
need to pull timestamp_ms for highest checkpoint in addition to the tx for the lowest checkpoint. updated to pass test_health_check
wlmyng
committed
address comments, add a test for pruning behavior
wlmyng
committed