Delete row sig_f8b77a996e1a from signals

id sig_f8b77a996e1a
event_id evt_a566477a2cc7
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-10T20:08:31.336847+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:324f0281314f09e3
throttle_s 0
created_at 2026-04-10T20:08:31.336847+00:00
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