Delete row sig_19289041333e from signals

id sig_19289041333e
event_id evt_4394777aa03b
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-19T16:13:02.012570+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:0396bc78edff26d2
throttle_s 0
created_at 2026-04-19T16:13:02.012570+00:00
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