Delete row sig_0594fbd83282 from signals

id sig_0594fbd83282
event_id evt_88e1052a8e96
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5721626 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-07T03:24:21Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-10T03:24:21.503803+00:00
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