Delete row sig_e123324fd222 from signals

id sig_e123324fd222
event_id evt_410cbd1f95fa
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-17T10:14:40.720775+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:6ebb3a02161ece0a
throttle_s 0
created_at 2026-04-17T10:14:40.720775+00:00
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