Delete row sig_b4d2f888f540 from signals

id sig_b4d2f888f540
event_id evt_028aba1c9129
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-22T07:23:30.526646+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:90ba57e2b160de9a
throttle_s 0
created_at 2026-04-22T07:23:30.526646+00:00
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