Delete row sig_423639c0770b from signals

id sig_423639c0770b
event_id evt_9755041a5a22
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-15T18:43:14.140385+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:484fb561701cd931
throttle_s 0
created_at 2026-04-15T18:43:14.140385+00:00
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