Delete row sig_ab787491a1be from signals

id sig_ab787491a1be
event_id evt_49b07fcfd82d
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-19T12:12:58.386745+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:764832033dea63e2
throttle_s 0
created_at 2026-04-19T12:12:58.386745+00:00
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