Delete row sig_6191f26252fb from signals

id sig_6191f26252fb
event_id evt_0d009e56d26b
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-19T14:13:03.209336+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:a9524ba4e7d7f991
throttle_s 0
created_at 2026-04-19T14:13:03.209336+00:00
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