Delete row sig_6068addb16f6 from signals

id sig_6068addb16f6
event_id evt_db995804c196
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-16T07:23:59.310814+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:8b1fcca29f3618c4
throttle_s 0
created_at 2026-04-16T07:23:59.310814+00:00
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