Delete row sig_453ce998c987 from signals

id sig_453ce998c987
event_id evt_ccbd1477a4b5
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-19T02:12:48.684498+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:8c5094908b5083c8
throttle_s 0
created_at 2026-04-19T02:12:48.684498+00:00
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