Refactor financial transaction handling: Consolidate Einnahmen and Ausgaben into Buchung model, update routes and UI components, and add new migration scripts for database schema changes.

prisma/migrations/20260324_consolidate_transactions/migration.sql

@@ -0,0 +1,41 @@
+-- CreateTable for BuchungKategorie
+CREATE TABLE `buchung_kategorien` (
+    `id` VARCHAR(191) NOT NULL,
+    `companyId` VARCHAR(191) NOT NULL,
+    `name` VARCHAR(191) NOT NULL,
+    `typ` VARCHAR(191) NOT NULL,
+    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+
+    INDEX `buchung_kategorien_companyId_idx`(`companyId`),
+    UNIQUE INDEX `buchung_kategorien_companyId_name_typ_key`(`companyId`, `name`, `typ`),
+    PRIMARY KEY (`id`)
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+-- AddForeignKey for BuchungKategorie
+ALTER TABLE `buchung_kategorien` ADD CONSTRAINT `buchung_kategorien_companyId_fkey` FOREIGN KEY (`companyId`) REFERENCES `companies`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AlterTable `buchungen` - add new columns
+ALTER TABLE `buchungen` ADD COLUMN `kategorie` VARCHAR(191) NULL;
+ALTER TABLE `buchungen` ADD COLUMN `steuersatz` INT NULL;
+ALTER TABLE `buchungen` ADD COLUMN `zahlungsart` ENUM('KASSE', 'BANK') NULL;
+ALTER TABLE `buchungen` ADD COLUMN `isBusinessRecord` BOOLEAN NOT NULL DEFAULT false;
+
+-- Add index for isBusinessRecord
+ALTER TABLE `buchungen` ADD INDEX `buchungen_isBusinessRecord_idx`(`isBusinessRecord`);
+
+-- Migrate existing data from betriebseinnahmen/betriebsausgaben to Buchung
+-- This is handled by the post-migration script
+
+-- AlterTable `betriebseinnahmen` - change kategorie from Enum to String
+ALTER TABLE `betriebseinnahmen` MODIFY `kategorie` VARCHAR(191) NOT NULL;
+ALTER TABLE `betriebseinnahmen` MODIFY `steuersatz` INT NOT NULL DEFAULT 0;
+
+-- AlterTable `betriebsausgaben` - change kategorie from Enum to String
+ALTER TABLE `betriebsausgaben` MODIFY `kategorie` VARCHAR(191) NOT NULL;
+ALTER TABLE `betriebsausgaben` MODIFY `steuersatz` INT NOT NULL DEFAULT 0;
+
+-- Drop old foreign key constraints from buchungen (if they exist from previous migration)
+-- These will be re-added if needed, but for now we're consolidating
+
+-- Note: The enum columns EinnahmeKategorie and AusgabeKategorie are automatically
+-- dropped by Prisma when they're no longer referenced in the schema.