Delete row sig_b9109a062a6b from signals

id sig_b9109a062a6b
event_id evt_de5e4d59d629
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T03:52:03.289901+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:e115c2bbf455163b
throttle_s 0
created_at 2026-04-12T03:52:03.289901+00:00
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