Delete row sig_0d220536060c from signals

id sig_0d220536060c
event_id evt_b2ae6fa2d399
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T08:08:18.634502+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:99c765074d952d57
throttle_s 0
created_at 2026-04-22T08:08:18.634502+00:00
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