Delete row sig_75db50131b2a from signals

id sig_75db50131b2a
event_id evt_85a95d0163b2
watcher_id NULL
signal_type discovery_earnings_calendar_delta
value {"as_of":"2026-04-21T00:08:29.826903+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_earnings_calendar
reason_trace {"_evidence_event_ids":["evt_cf077666d ...
dedupe_key signal_enriched:discovery_earnings_calendar_delta: ...
throttle_s 0
created_at 2026-04-21T00:08:29.826903+00:00
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