Delete row sig_604236e74751 from signals

id sig_604236e74751
event_id evt_92097a2186ea
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T00:28:03.900438+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:7990122d37daf7f2
throttle_s 0
created_at 2026-04-08T00:28:03.900438+00:00
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