Fix vt=0 being ignored in read() method

[Copilot]

The read() method was missing the None check that read_batch() and read_with_poll() already had, causing vt=0 (immediate visibility) to be incorrectly treated.

Changes

• pgmq_sqlalchemy/queue.py: Added if vt is None: vt = self.vt check in read() method before passing to internal methods
• tests/test_queue.py: Added test_send_and_read_msg_with_vt_zero to verify vt=0 behavior

Example

# vt=0 should make message immediately visible
msg_id = pgmq.send(queue_name, {'data': 'value'})
msg = pgmq.read(queue_name, vt=0)  # Now correctly uses 0 seconds

# Can immediately read again
msg = pgmq.read(queue_name)  # Message is visible

Without this fix, vt=0 would be passed directly to internal methods that expect a resolved value, potentially causing incorrect behavior if the code path assumed falsy values should default.

Warning

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• install.python-poetry.org
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Original prompt

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This section details on the original issue you should resolve

<issue_title>bug: vt will be set to default vt if provided with 0</issue_title>
<issue_description>- about: visibility timeout will be set to default timeout ( 30 sec ) if vt is provide with 0

• solution: use check vt is None instead of vt or self.vt</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes bug: vt will be set to default vt if provided with 0 #6

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