Delete row sig_323007e18497 from signals

id sig_323007e18497
event_id evt_c19986426ff7
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-19T10:54:52.773566+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:8bc90e6e867eadc1
throttle_s 0
created_at 2026-04-19T10:54:52.773566+00:00
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