Delete row sig_11d3e8f56d7c from signals

id sig_11d3e8f56d7c
event_id evt_ef8d0a93682b
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-21T06:46:15.868384+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:60848657ce6c4a83
throttle_s 0
created_at 2026-04-21T06:46:15.868384+00:00
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