Delete row sig_abca806eb71d from signals

id sig_abca806eb71d
event_id evt_cd52a92edf7e
watcher_id NULL
signal_type discovery_earnings_calendar_delta
value {"as_of":"2026-04-08T19:57:42.365437+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_earnings_calendar
reason_trace {"_evidence_event_ids":["evt_e4fe023ab ...
dedupe_key signal_enriched:discovery_earnings_calendar_delta: ...
throttle_s 0
created_at 2026-04-08T19:57:42.365437+00:00
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