Delete row sig_7f56c1e1b3b5 from signals

id sig_7f56c1e1b3b5
event_id evt_394ad739a07b
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T19:12:02.260024+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:79c864a3e909a2da
throttle_s 0
created_at 2026-04-20T19:12:02.260024+00:00
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