Delete row sig_6df9a8b313c6 from signals

id sig_6df9a8b313c6
event_id evt_430b92370108
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T15:34:52.336912+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:ad2f4fe963051e03
throttle_s 0
created_at 2026-04-18T15:34:52.336912+00:00
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