fix(editor): Change the underlying data store db column types to support decimal numbers (#18549)

packages/@n8n/db/src/migrations/dsl/column.ts

@@ -9,7 +9,8 @@ export class Column {
 		| 'json'
 		| 'timestamptz'
 		| 'timestamp'
-		| 'uuid';
+		| 'uuid'
+		| 'double';
 
 	private isGenerated = false;
 
@@ -39,6 +40,11 @@ export class Column {
 		return this;
 	}
 
+	get double() {
+		this.type = 'double';
+		return this;
+	}
+
 	varchar(length?: number) {
 		this.type = 'varchar';
 		this.length = length ?? 'auto';
@@ -162,6 +168,14 @@ export class Column {
 			if (isMysql) options.type = 'varchar(36)';
 			// we haven't been defining length on "uuid" varchar on sqlite
 			if (isSqlite) options.type = 'varchar';
+		} else if (type === 'double') {
+			if (isPostgres) {
+				options.type = 'double precision';
+			} else if (isMysql) {
+				options.type = 'double';
+			} else if (isSqlite) {
+				options.type = 'real';
+			}
 		}
 
 		if (

packages/cli/src/modules/data-store/__tests__/data-store.controller.test.ts

@@ -2072,6 +2072,14 @@ describe('POST /projects/:projectId/data-stores/:dataStoreId/insert', () => {
 					name: 'c',
 					type: 'number',
 				},
+				{
+					name: 'd',
+					type: 'number',
+				},
+				{
+					name: 'e',
+					type: 'number',
+				},
 			],
 		});
 
@@ -2081,7 +2089,8 @@ describe('POST /projects/:projectId/data-stores/:dataStoreId/insert', () => {
 					a: 1,
 					b: 0,
 					c: -1,
-					// d: 0.2340439341231259,
+					d: 0.2340439341231259,
+					e: 2340439341231259,
 				},
 			],
 		};
@@ -2099,8 +2108,7 @@ describe('POST /projects/:projectId/data-stores/:dataStoreId/insert', () => {
 		expect(readResponse.body.data.data[0]).toMatchObject(payload.data[0]);
 	});
 
-	// eslint-disable-next-line n8n-local-rules/no-skipped-tests
-	test.skip('should insert columns with null values', async () => {
+	test('should insert columns with null values', async () => {
 		const dataStore = await createDataStore(memberProject, {
 			columns: [
 				{

packages/cli/src/modules/data-store/__tests__/sql-utils.test.ts

@@ -10,13 +10,40 @@ import {
 
 describe('sql-utils', () => {
 	describe('addColumnQuery', () => {
-		it('should generate a valid SQL query for adding columns to a table', () => {
+		it('should generate a valid SQL query for adding columns to a table, sqlite', () => {
 			const tableName = 'data_store_user_abc';
 			const column = { name: 'email', type: 'number' as const };
 
 			const query = addColumnQuery(tableName, column, 'sqlite');
 
-			expect(query).toBe('ALTER TABLE "data_store_user_abc" ADD "email" FLOAT');
+			expect(query).toBe('ALTER TABLE "data_store_user_abc" ADD "email" REAL');
+		});
+
+		it('should generate a valid SQL query for adding columns to a table, postgres', () => {
+			const tableName = 'data_store_user_abc';
+			const column = { name: 'email', type: 'number' as const };
+
+			const query = addColumnQuery(tableName, column, 'postgres');
+
+			expect(query).toBe('ALTER TABLE "data_store_user_abc" ADD "email" DOUBLE PRECISION');
+		});
+
+		it('should generate a valid SQL query for adding columns to a table, mysql', () => {
+			const tableName = 'data_store_user_abc';
+			const column = { name: 'email', type: 'number' as const };
+
+			const query = addColumnQuery(tableName, column, 'mysql');
+
+			expect(query).toBe('ALTER TABLE `data_store_user_abc` ADD `email` DOUBLE');
+		});
+
+		it('should generate a valid SQL query for adding columns to a table, mariadb', () => {
+			const tableName = 'data_store_user_abc';
+			const column = { name: 'email', type: 'number' as const };
+
+			const query = addColumnQuery(tableName, column, 'mariadb');
+
+			expect(query).toBe('ALTER TABLE `data_store_user_abc` ADD `email` DOUBLE');
 		});
 	});
 

packages/cli/src/modules/data-store/utils/sql-utils.ts

@@ -17,7 +17,7 @@ export function toDslColumns(columns: DataStoreCreateColumnSchema[]): DslColumn[
 
 		switch (col.type) {
 			case 'number':
-				return name.int;
+				return name.double;
 			case 'boolean':
 				return name.bool;
 			case 'string':
@@ -38,7 +38,17 @@ function dataStoreColumnTypeToSql(
 		case 'string':
 			return 'TEXT';
 		case 'number':
-			return 'FLOAT';
+			switch (dbType) {
+				case 'postgres':
+					return 'DOUBLE PRECISION';
+				case 'mysql':
+				case 'mariadb':
+					return 'DOUBLE';
+				case 'sqlite':
+					return 'REAL';
+				default:
+					return 'DOUBLE';
+			}
 		case 'boolean':
 			return 'BOOLEAN';
 		case 'date':