Delete row sig_a3d1bf78f8f4 from signals

id sig_a3d1bf78f8f4
event_id evt_b900f4689db6
watcher_id NULL
signal_type discovery_earnings_calendar_delta
value {"as_of":"2026-04-12T00:38:28.481951+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_earnings_calendar
reason_trace {"_evidence_event_ids":["evt_c8d2174a9 ...
dedupe_key signal_enriched:discovery_earnings_calendar_delta: ...
throttle_s 0
created_at 2026-04-12T00:38:28.481951+00:00
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