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data/sql/base/database-squash.md

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+New process around handling database squashes since https://github.com/azerothcore/azerothcore-wotlk/pull/18197
+
+> [!CAUTION]
+> These steps are only for project maintainers who intend to update base files.
+
+## Requirements
+
+1. MySQL
+2. mysqldump
+
+## Usage
+
+> [!IMPORTANT]
+> A squash needs to be done on a clean database. Drop all tables in Auth, Characters and World.
+
+1. Run DatabaseSquash.sh (Located in ..\apps\DatabaseSquash\)
+2. Make a PR
+
+> [!IMPORTANT]
+> No DB PRs should be merged during this process!
+
+> [!NOTE]
+> During the DB squash procedure, we do NOT move files.
+> The archive dir is NO longer used as part of the DB squash procedure, 
+> but simply as a place where to move update files when they get too many
+> as the `updates` table in base files always will contain the entries from the updates dir they will never be run again on a clean setup.