Delete row sig_a853cba0578d from signals

id sig_a853cba0578d
event_id evt_c4d9f6fc31bc
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5178220 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-07T21:10:12Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-10T21:10:12.358161+00:00
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