Delete row sig_268eb8112169 from signals

id sig_268eb8112169
event_id evt_f404c05581f4
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T06:52:42.909323+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:a418a403c7f84813
throttle_s 0
created_at 2026-04-12T06:52:42.909323+00:00
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