Delete row sig_7897597f3010 from signals

id sig_7897597f3010
event_id evt_42330289a8c8
watcher_id NULL
signal_type discovery_earnings_calendar_delta
value {"as_of":"2026-04-18T09:10:19.576061+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_earnings_calendar
reason_trace {"_evidence_event_ids":["evt_abde383d3 ...
dedupe_key signal_enriched:discovery_earnings_calendar_delta: ...
throttle_s 0
created_at 2026-04-18T09:10:19.576061+00:00
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