Delete row sig_1b0934332be8 from signals

id sig_1b0934332be8
event_id evt_a246b8714541
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5705014 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-07T21:15:12Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-10T21:15:12.276797+00:00
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