Delete row sig_ef469fb103f5 from signals

id sig_ef469fb103f5
event_id evt_56849653e14b
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T17:49:24.257969+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:8d7e82b08b066591
throttle_s 0
created_at 2026-04-18T17:49:24.257969+00:00
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