Delete row sig_fc202c0c135c from signals

id sig_fc202c0c135c
event_id evt_59c02a72b8d6
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T00:41:25.445970+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:b024fc58a8aac861
throttle_s 0
created_at 2026-04-11T00:41:25.445970+00:00
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