Delete row sig_78e22ce1254b from signals

id sig_78e22ce1254b
event_id evt_9ff98c3c5cef
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T08:10:07.808241+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:8431dedb340fb87d
throttle_s 0
created_at 2026-04-08T08:10:07.808241+00:00
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