Delete row sig_b56ffbcb6b1c from signals

id sig_b56ffbcb6b1c
event_id evt_d8069989ec32
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-14T10:48:37.984727+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:70392fef343d0c97
throttle_s 0
created_at 2026-04-14T10:48:37.984727+00:00
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