Delete row sig_ccfb0be00928 from signals

id sig_ccfb0be00928
event_id evt_61bd61beb5b6
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T11:09:45.770947+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:695f2c9603c72c04
throttle_s 0
created_at 2026-04-08T11:09:45.770947+00:00
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