Delete row sig_e546169c0daf from signals

id sig_e546169c0daf
event_id evt_cb9c29e341cd
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T11:27:35.438867+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:7a8bc0e7aa243106
throttle_s 0
created_at 2026-04-18T11:27:35.438867+00:00
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