Delete row sig_a22a9f6ca212 from signals

id sig_a22a9f6ca212
event_id evt_0d115f09bbfd
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T17:45:26.988067+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:79803430c4fd656e
throttle_s 0
created_at 2026-04-20T17:45:26.988067+00:00
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