Delete row sig_e6e9816ff049 from signals

id sig_e6e9816ff049
event_id evt_56cdaa88d9b1
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T13:12:35.710303+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:29d3a355f4cd4ab2
throttle_s 0
created_at 2026-04-18T13:12:35.710303+00:00
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