perf: add tasks_v3 index on (flow_id, run_number, step_name) for lateral joins - #500
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Fixes Netflix#475 The steps_v3 table's lateral join queries tasks_v3 on (flow_id, run_number, step_name). The existing composite index uses run_id (string) instead of run_number (integer), preventing PostgreSQL from using the index for these joins. This index supports joins in step queries with enable_joins=True, including step API endpoints and heartbeat monitoring.
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Fixes
Fixes #475
Summary
Adds a concurrent composite index
tasks_v3_idx_flow_run_number_stepon(flow_id, run_number, step_name)so lateral joins fromsteps_v3can use an index matchingrun_number(not onlyrun_id).Test plan
IF NOT EXISTS, up/down)