Delete row sig_35f78ba03db1 from signals

id sig_35f78ba03db1
event_id evt_619541895fcb
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T06:44:59.688368+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:ca56c73a71e6a889
throttle_s 0
created_at 2026-04-20T06:44:59.688368+00:00
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