Delete row sig_d707f328e66c from signals

id sig_d707f328e66c
event_id evt_c8c57d0907db
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T11:19:54.885579+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:c80a5ca49173402d
throttle_s 0
created_at 2026-04-08T11:19:54.885579+00:00
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