Delete row sig_8effcd1a7a7f from signals

id sig_8effcd1a7a7f
event_id evt_0105bac0ea49
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-05T10:43:51.135154+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:7d419ccb2ee52466
throttle_s 0
created_at 2026-04-05T10:43:51.135154+00:00
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