OperationalError: cannot commit - no transaction is active in core/src/Db/Db.py line 169 (reason: Interval)

### Step 1: Please describe your environment

* ZeroNet version: r4404
* Operating system: W10
* Web browser: FF beta
* Tor status: error
* Opened port: no

### Step 2: Describe the problem:

debug.log shows:

ERROR Db#0:Chart Commit error: OperationalError: cannot commit - no transaction is active in core/src/Db/Db.py line 169 (reason: Interval)

on restart it not appeared, then i quit and start again and appeared again.

Start by reading core/src/Db/Db.py around line 169 and inspect the debug.log entry for the Chart commit error. Reproduce the reported quit-and-restart sequence if possible, then determine whether the interval-related path still attempts a commit without an active transaction. Done means the reported error no longer appears during the described restart flow.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.