Delete row sig_a1a83f9a779d from signals

id sig_a1a83f9a779d
event_id evt_f5eaea1c9094
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-21T03:14:17.518654+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:5381cfc9397a39fc
throttle_s 0
created_at 2026-04-21T03:14:17.518654+00:00
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