Delete row sig_b38fdfe2b942 from signals

id sig_b38fdfe2b942
event_id evt_b05c89ac8ff7
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-19T19:53:53.605981+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:651fe4e88446f388
throttle_s 0
created_at 2026-04-19T19:53:53.605981+00:00
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