Delete row sig_757a8e03545b from signals

id sig_757a8e03545b
event_id evt_90813b5fc424
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-22T13:08:19.333979+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:5f45aa3b2c805dd2
throttle_s 0
created_at 2026-04-22T13:08:19.333979+00:00
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