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Branches and databases from the preview's earlier shapes are not supported, and such branches are recreated. The earlier shapes are the copy model, where a branch file kept its own data payload, and the tables registered as 0150-add-file-branch-table, 0152-add-file-branch-table and 0153-add-file-pull-request-tables. This commit removes the code that existed only for them. A fresh database ends with the same schema as before. - 0155-add-file-branch-table.sql loses its header about the old registrations, every IF NOT EXISTS, and the base_branch_revn upgrade and backfill. CREATE TABLE file_branch already declares the column. - 0156 and 0157 lose every IF NOT EXISTS. - 0158-add-file-branch-change-data-version folds into 0157, and its file and registration go. CREATE TABLE file_branch_change declares data_version NOT NULL, because both writers of the op log, a branch save and the squash of an update from main, stamp every row. - need-migration-to? loses its nil case, which replayed an unstamped op-log row at the base's version, and the branch derive loses the comment that described it. Stamped rows replay as before. - The tests for a re-run of the branch table migration and for the replay of an unstamped row go, with the require the first one used. A database that holds the preview's older shapes must drop its branching tables and the file.is_branch column, and delete the branching steps from its migrations table, before it boots this code. A database that ran 0157 without 0158 lacks data_version and counts as an older shape. A database that already ran 0155 to 0158 under these names keeps working, because a migration runs once per name. AI-assisted-by: claude-opus-5-5