Delete row sig_667a003c6f67 from signals

id sig_667a003c6f67
event_id evt_fb74ea8092c6
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T19:55:21.638833+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:fe0f8fb5a6d1a6cc
throttle_s 0
created_at 2026-04-19T19:55:21.638833+00:00
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