Delete row sig_9529bacd0613 from signals

id sig_9529bacd0613
event_id evt_127909ad6b1e
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T01:55:16.634694+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:0c87337710ebe471
throttle_s 0
created_at 2026-04-20T01:55:16.634694+00:00
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