Delete row sig_52905ed81906 from signals

id sig_52905ed81906
event_id evt_3d2194f4f37d
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-21T15:14:31.972297+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:490563527c471e2b
throttle_s 0
created_at 2026-04-21T15:14:31.972297+00:00
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