Delete row sig_15a250775157 from signals

id sig_15a250775157
event_id evt_90d45e0eb426
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-21T11:52:49.317036+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:30049caaab32cd57
throttle_s 0
created_at 2026-04-21T11:52:49.317036+00:00
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