Fix PSQL for /cupboard/broken-merge-proposals

[g0tmi1k]

Requesting: /cupboard/broken-merge-proposals

Errors with:

Traceback (most recent call last):
  File "/usr/local/lib/python3.13/dist-packages/aiohttp/web_protocol.py", line 480, in _handle_request
    resp = await request_handler(request)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/dist-packages/aiohttp/web_app.py", line 569, in _handle
    return await handler(request)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/dist-packages/aiohttp/web_middlewares.py", line 117, in impl
    return await handler(request)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/dist-packages/janitor/site/openid.py", line 40, in openid_middleware
    resp = await handler(request)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/dist-packages/aiohttp_openmetrics/__init__.py", line 79, in metrics_middleware
    response = await handler(request)
               ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/dist-packages/aiohttp/web_middlewares.py", line 105, in impl
    return await handler(request)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/dist-packages/janitor/state.py", line 263, in asyncpg_error_middleware
    resp = await handler(request)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/dist-packages/aiozipkin/aiohttp_helpers.py", line 157, in aiozipkin_middleware
    resp = await handler(request)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/dist-packages/janitor/site/common.py", line 377, in handle
    vs = await fn(request)
         ^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/dist-packages/janitor/site/cupboard/__init__.py", line 389, in handle_broken_mps
            broken_mps = await conn.fetch(
                         ^^^^^^^^^^^^^^^^^
    ...<23 lines>...
            )
            ^
  File "/usr/local/lib/python3.13/dist-packages/asyncpg/connection.py", line 690, in fetch
    return await self._execute(
           ^^^^^^^^^^^^^^^^^^^^
    ...<5 lines>...
    )
    ^
  File "/usr/local/lib/python3.13/dist-packages/asyncpg/connection.py", line 1864, in _execute
    result, _ = await self.__execute(
                ^^^^^^^^^^^^^^^^^^^^^
    ...<7 lines>...
    )
    ^
  File "/usr/local/lib/python3.13/dist-packages/asyncpg/connection.py", line 1961, in __execute
    result, stmt = await self._do_execute(
                   ^^^^^^^^^^^^^^^^^^^^^^^
    ...<5 lines>...
    )
    ^
  File "/usr/local/lib/python3.13/dist-packages/asyncpg/connection.py", line 2004, in _do_execute
    stmt = await self._get_statement(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<4 lines>...
    )
    ^
  File "/usr/local/lib/python3.13/dist-packages/asyncpg/connection.py", line 432, in _get_statement
    statement = await self._protocol.prepare(
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<5 lines>...
    )
    ^
  File "asyncpg/protocol/protocol.pyx", line 165, in prepare
asyncpg.exceptions.AmbiguousColumnError: column reference "codebase" is ambiguous

[jelmer]

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