Delete row sig_db9413be7510 from signals

id sig_db9413be7510
event_id evt_5ab424d9a6a6
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T17:00:24.658403+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:1c6d2ba58af07d2f
throttle_s 0
created_at 2026-04-20T17:00:24.658403+00:00
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