Kpa-clawbot 45d8116880 perf: query only matching node locations in handleObservers (#579) ...

## Summary

`handleObservers()` in `routes.go` was calling `GetNodeLocations()`
which fetches ALL nodes from the DB just to match ~10 observer IDs
against node public keys. With 500+ nodes this is wasteful.

## Changes

- **`db.go`**: Added `GetNodeLocationsByKeys(keys []string)` — queries
only the rows matching the given public keys using a parameterized
`WHERE LOWER(public_key) IN (?, ?, ...)` clause.
- **`routes.go`**: `handleObservers` now collects observer IDs and calls
the targeted method instead of the full-table scan.
- **`coverage_test.go`**: Added `TestGetNodeLocationsByKeys` covering
known key, empty keys, and unknown key cases.

## Performance

With ~10 observers and 500+ nodes, the query goes from scanning all 500
rows to fetching only ~10. The original `GetNodeLocations()` is
preserved for any other callers.

Fixes #378

Co-authored-by: you <you@example.com>

2026-04-04 10:14:37 -07:00

..

ingestor

test: push ingestor coverage from 70% to 84% (#344) (#492)

2026-04-02 17:31:47 -07:00

server

perf: query only matching node locations in handleObservers (#579)

2026-04-04 10:14:37 -07:00