Delete row sig_8d390d81656e from signals

id sig_8d390d81656e
event_id evt_23a0fa3b11de
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T19:47:51.425023+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:53a15c1a84ab812d
throttle_s 0
created_at 2026-04-12T19:47:51.425023+00:00
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