Database cleanup

This module gives administrators a set of cleanup wizards, all grouped in a new 'Database cleanup' menu under Settings > Technical, visible only to system administrators.

Each wizard first scans the database and lists what it considers leftover, then lets you purge items one by one or all at once: - Purge obsolete modules: modules recorded in Odoo whose code is no longer present on the server; installed ones are uninstalled first, then their records are removed. - Purge obsolete models: models registered in Odoo that no longer exist in the system; related constraints, relations and attachments references are cleaned up too. - Purge obsolete fields: field definitions that no longer match a real field on their model; the field and, where relevant, its database column are dropped. - Purge obsolete columns: database columns that no longer correspond to any field of the table. - Purge obsolete tables: SQL tables and views that are not used by any model or many-to-many relation (a few internal tables are protected). - Purge obsolete data entries: external identifiers pointing to missing models or missing records. - Purge obsolete menu entries: menus whose action or target model no longer exists. - Create missing indexes: lists fields marked as indexed whose database index is absent and creates it.

Only system administrators can create these cleanup lines; each purge action must be confirmed manually and marks the line as done. The module also makes standard uninstall routines tolerate references to models that no longer exist.