Delete row sig_17be384cbd2e from signals

id sig_17be384cbd2e
event_id evt_a26d92864508
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":389,"confidence":0.5717257 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-03-31T20:50:44Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-03T20:50:44.476861+00:00
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