Delete row sig_6db071651cd5 from signals

id sig_6db071651cd5
event_id evt_a778b66029a0
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T19:51:05.756476+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:f7ac2eabf4a66660
throttle_s 0
created_at 2026-04-20T19:51:05.756476+00:00
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