Delete row sig_40f7f384e22a from signals

id sig_40f7f384e22a
event_id evt_9461b945859b
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-07T18:31:26.148445+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:4213756f1e3290de
throttle_s 0
created_at 2026-04-07T18:31:26.148445+00:00
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