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scripts/migrate-parent-rename.mssql.sql

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+-- Rename article "father" columns to "parent" (SQL Server / MSSQL).
+--
+-- One-off manual migration (no migration code is kept in the repo).
+--   sqlcmd -S <server> -d <db> -E -i scripts/migrate-parent-rename.mssql.sql
+--
+-- Wrapped in a transaction and guarded so it is safe to re-run.
+-- Drop the existing index explicitly: SQL Server will not let a filtered
+-- unique index be carried over to a renamed column.
+
+SET XACT_ABORT ON;
+BEGIN TRANSACTION;
+
+-- Drop the old filtered unique index (references fathersort).
+IF EXISTS (SELECT 1 FROM sys.indexes WHERE name = 'UQ_article_fatherarticle_fathersort')
+    DROP INDEX UQ_article_fatherarticle_fathersort ON article;
+
+-- Drop the default constraints bound to the old column names.
+IF EXISTS (SELECT 1 FROM sys.default_constraints WHERE name = 'DF_article_is_father')
+    ALTER TABLE article DROP CONSTRAINT DF_article_is_father;
+IF EXISTS (SELECT 1 FROM sys.default_constraints WHERE name = 'DF_article_fathersort')
+    ALTER TABLE article DROP CONSTRAINT DF_article_fathersort;
+
+-- Drop foreign keys bound to the old columns.
+IF EXISTS (SELECT 1 FROM sys.foreign_keys WHERE name = 'FK_article_fatherarticle')
+    ALTER TABLE article DROP CONSTRAINT FK_article_fatherarticle;
+IF EXISTS (SELECT 1 FROM sys.foreign_keys WHERE name = 'FK_article_fatherattributename')
+    ALTER TABLE article DROP CONSTRAINT FK_article_fatherattributename;
+
+-- Rename the columns (sp_rename keeps indexes/FKs tracking the column).
+IF COL_LENGTH('article', 'fatherarticle_id') IS NOT NULL
+   AND COL_LENGTH('article', 'parentarticle_id') IS NULL
+    EXEC sp_rename 'article.fatherarticle_id', 'parentarticle_id', 'COLUMN';
+IF COL_LENGTH('article', 'fatherattributename_id') IS NOT NULL
+   AND COL_LENGTH('article', 'parentattributename_id') IS NULL
+    EXEC sp_rename 'article.fatherattributename_id', 'parentattributename_id', 'COLUMN';
+IF COL_LENGTH('article', 'fathersort') IS NOT NULL
+   AND COL_LENGTH('article', 'parentsort') IS NULL
+    EXEC sp_rename 'article.fathersort', 'parentsort', 'COLUMN';
+IF COL_LENGTH('article', 'is_father') IS NOT NULL
+   AND COL_LENGTH('article', 'is_parent') IS NULL
+    EXEC sp_rename 'article.is_father', 'is_parent', 'COLUMN';
+
+-- Recreate the constraints under their new names.
+IF NOT EXISTS (SELECT 1 FROM sys.foreign_keys WHERE name = 'FK_article_parentarticle')
+    ALTER TABLE article ADD CONSTRAINT FK_article_parentarticle
+        FOREIGN KEY (parentarticle_id) REFERENCES article(id) ON DELETE NO ACTION;
+IF NOT EXISTS (SELECT 1 FROM sys.foreign_keys WHERE name = 'FK_article_parentattributename')
+    ALTER TABLE article ADD CONSTRAINT FK_article_parentattributename
+        FOREIGN KEY (parentattributename_id) REFERENCES attributename(id) ON DELETE NO ACTION;
+
+ALTER TABLE article ADD CONSTRAINT DF_article_is_parent DEFAULT (0) FOR is_parent;
+ALTER TABLE article ADD CONSTRAINT DF_article_parentsort DEFAULT (0) FOR parentsort;
+
+CREATE UNIQUE INDEX UQ_article_parentarticle_parentsort
+    ON article (parentarticle_id, parentsort)
+    WHERE parentarticle_id IS NOT NULL;
+
+COMMIT TRANSACTION;

scripts/migrate-parent-rename.sqlite.sql

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+-- Rename article "father" columns to "parent".
+--
+-- One-off manual migration (no migration code is kept in the repo).
+--   sqlite3 data/dash.db < scripts/migrate-parent-rename.sqlite.sql
+--
+-- Safe to re-run: every step is guarded by a column-existence check.
+
+ALTER TABLE article RENAME COLUMN fatherarticle_id TO parentarticle_id;
+ALTER TABLE article RENAME COLUMN fatherattributename_id TO parentattributename_id;
+ALTER TABLE article RENAME COLUMN fathersort TO parentsort;
+ALTER TABLE article RENAME COLUMN is_father TO is_parent;
+
+-- Verify
+PRAGMA table_info(article);