Delete row sig_a6991f076f6d from signals

id sig_a6991f076f6d
event_id evt_ef18159d3466
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T03:40:59.764119+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:43cd4dd74a3f6361
throttle_s 0
created_at 2026-04-12T03:40:59.764119+00:00
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