Delete row sig_26d544eb9fc9 from signals

id sig_26d544eb9fc9
event_id evt_8e0a93e618f4
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T17:46:25.199630+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:f52ee633468d4fa9
throttle_s 0
created_at 2026-04-19T17:46:25.199630+00:00
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