Delete row sig_78538c8b7f71 from signals

id sig_78538c8b7f71
event_id evt_53e4b16e2da8
watcher_id NULL
signal_type discovery_earnings_calendar_snapshot
value {"as_of":"2026-04-09T19:34:12.194291+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_earnings_calendar
reason_trace {}
dedupe_key discovery_earnings_calendar_snapshot:d846829f1f1e2 ...
throttle_s 0
created_at 2026-04-09T19:34:12.194291+00:00
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