Delete row sig_df28daab5f79 from signals

id sig_df28daab5f79
event_id evt_9399096f6ea0
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-14T14:10:38.536039+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:d7a92de16e7654f3
throttle_s 0
created_at 2026-04-14T14:10:38.536039+00:00
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