Delete row sig_0c1520d4a11f from signals

id sig_0c1520d4a11f
event_id evt_889f85820c48
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.7266158 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-05T20:20:09Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-08T20:20:09.226883+00:00
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