Delete row sig_77b89050184f from signals

id sig_77b89050184f
event_id evt_232add2e2e42
watcher_id NULL
signal_type discovery_earnings_calendar_delta
value {"as_of":"2026-04-15T08:18:41.891249+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_earnings_calendar
reason_trace {"_evidence_event_ids":["evt_9e6d0f59b ...
dedupe_key signal_enriched:discovery_earnings_calendar_delta: ...
throttle_s 0
created_at 2026-04-15T08:18:41.891249+00:00
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