Delete row sig_a4a77da297a4 from signals

id sig_a4a77da297a4
event_id evt_b125a27c749e
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.6447888 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-13T20:27:42Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-16T20:27:42.234382+00:00
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