Delete row sig_14783693b603 from signals

id sig_14783693b603
event_id evt_c0c15b7be292
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-12T23:09:38.515805+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:500b171f51a3b923
throttle_s 0
created_at 2026-04-12T23:09:38.515805+00:00
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