Delete row sig_48b4b6a0f3a1 from signals

id sig_48b4b6a0f3a1
event_id evt_acefe9d8933f
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T13:57:35.148713+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:716e4d61b34b9614
throttle_s 0
created_at 2026-04-22T13:57:35.148713+00:00
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