Delete row sig_d1f745ca126b from signals

id sig_d1f745ca126b
event_id evt_32ddf388d840
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-21T05:54:20.838606+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:698e4eb21282bf6f
throttle_s 0
created_at 2026-04-21T05:54:20.838606+00:00
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