Delete row sig_554eb2250388 from signals

id sig_554eb2250388
event_id evt_c883531092b7
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-17T22:01:46.188386+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:410b3b04c1262e48
throttle_s 0
created_at 2026-04-17T22:01:46.188386+00:00
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