Delete row sig_8df2be75a287 from signals

id sig_8df2be75a287
event_id evt_43791474ec25
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-13T14:09:54.294477+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:154eb718dbc70ecd
throttle_s 0
created_at 2026-04-13T14:09:54.294477+00:00
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