Delete row sig_11187e654448 from signals

id sig_11187e654448
event_id evt_c806873483ef
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T05:39:57.974496+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:6d3bcd54d945f128
throttle_s 0
created_at 2026-04-22T05:39:57.974496+00:00
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