Delete row sig_6ef4cf89ef4e from signals

id sig_6ef4cf89ef4e
event_id evt_06d828ee14fa
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T13:56:54.120167+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:42d8fe441eef1f74
throttle_s 0
created_at 2026-04-12T13:56:54.120167+00:00
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