Delete row sig_2b6cd0fc7bfc from signals

id sig_2b6cd0fc7bfc
event_id evt_36bd26f75d17
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-22T15:15:23.171542+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:81a1410d2f8080eb
throttle_s 0
created_at 2026-04-22T15:15:23.171542+00:00
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