Delete row sig_5e1497cda703 from signals

id sig_5e1497cda703
event_id evt_6fcafac9e721
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T08:50:51.526459+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:a5f69ba078e2187f
throttle_s 0
created_at 2026-04-22T08:50:51.526459+00:00
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