Delete row sig_dbfce712515f from signals

id sig_dbfce712515f
event_id evt_587f4577777a
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T00:53:22.545180+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:7ffbe3f88d6eed9f
throttle_s 0
created_at 2026-04-22T00:53:22.545180+00:00
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