Delete row sig_b96d4bc4c211 from signals

id sig_b96d4bc4c211
event_id evt_c4402dc00b50
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-21T15:49:05.842402+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:354b617bfd6657f7
throttle_s 0
created_at 2026-04-21T15:49:05.842402+00:00
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