Delete row sig_b22a130b1186 from signals

id sig_b22a130b1186
event_id evt_aa7917c9e16d
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T09:39:23.604239+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:49acb2effacc2c8a
throttle_s 0
created_at 2026-04-12T09:39:23.604239+00:00
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