Delete row sig_6869ed19a647 from signals

id sig_6869ed19a647
event_id evt_e937688855a1
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-14T09:44:07.159065+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:fd0fa513d7da2c1d
throttle_s 0
created_at 2026-04-14T09:44:07.159065+00:00
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