Delete row sig_9e93b90ca453 from signals

id sig_9e93b90ca453
event_id evt_46e80fb7a9c4
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-09T11:22:51.631967+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:97e37d6eba9c2076
throttle_s 0
created_at 2026-04-09T11:22:51.631967+00:00
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