Delete row sig_5c271e135121 from signals

id sig_5c271e135121
event_id evt_30ebd2bce4b5
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-07T10:22:34.013647+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:02bc2973e190dc4d
throttle_s 0
created_at 2026-04-07T10:22:34.013647+00:00
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