Delete row sig_171a8824103f from signals

id sig_171a8824103f
event_id evt_621e95869f8c
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-19T18:24:03.340694+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:ca4f33cd6814e8f5
throttle_s 0
created_at 2026-04-19T18:24:03.340694+00:00
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