Delete row sig_270ae4d6c499 from signals

id sig_270ae4d6c499
event_id evt_02f34bb26741
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T04:54:39.789480+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:435a4b0b19d62b86
throttle_s 0
created_at 2026-04-12T04:54:39.789480+00:00
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