diff --git a/modules/mining-checker/src/Infrastructure/SchemaManager.php b/modules/mining-checker/src/Infrastructure/SchemaManager.php
index f421522..4b103d8 100644
--- a/modules/mining-checker/src/Infrastructure/SchemaManager.php
+++ b/modules/mining-checker/src/Infrastructure/SchemaManager.php
@@ -377,6 +377,8 @@ final class SchemaManager
             throw new ApiException($exception->getMessage(), 422);
         }
 
+        $this->prepareSchemaForSqlImport();
+
         $statementCount = $this->executeSqlContent((string) $file['sql'], (string) $file['file']);
 
         return [
@@ -386,6 +388,58 @@ final class SchemaManager
         ];
     }
 
+    private function prepareSchemaForSqlImport(): void
+    {
+        $status = $this->schemaStatus();
+        if (!$status['all_present']) {
+            $this->initializeSchema(false);
+        }
+
+        $this->upgradeSchemaDirect();
+        $this->ensureLegacyImportCompatibility();
+    }
+
+    private function ensureLegacyImportCompatibility(): void
+    {
+        $this->ensureLegacyMinerOfferImportColumns();
+    }
+
+    private function ensureLegacyMinerOfferImportColumns(): void
+    {
+        $table = $this->prefix . 'miner_offers';
+        if (!$this->tableExists($table)) {
+            return;
+        }
+
+        $statements = $this->driver === 'pgsql'
+            ? [
+                'ALTER TABLE ' . $table . ' ADD COLUMN IF NOT EXISTS price_amount NUMERIC(20,8)',
+                'ALTER TABLE ' . $table . ' ADD COLUMN IF NOT EXISTS price_currency VARCHAR(10)',
+                'ALTER TABLE ' . $table . ' ADD COLUMN IF NOT EXISTS usd_reference_amount NUMERIC(20,8)',
+                'ALTER TABLE ' . $table . ' ADD COLUMN IF NOT EXISTS reference_price_amount NUMERIC(20,8)',
+                'ALTER TABLE ' . $table . ' ADD COLUMN IF NOT EXISTS reference_price_currency VARCHAR(10)',
+            ]
+            : [
+                'ALTER TABLE `' . $table . '` ADD COLUMN price_amount DECIMAL(20,8) NULL',
+                'ALTER TABLE `' . $table . '` ADD COLUMN price_currency VARCHAR(10) NULL',
+                'ALTER TABLE `' . $table . '` ADD COLUMN usd_reference_amount DECIMAL(20,8) NULL',
+                'ALTER TABLE `' . $table . '` ADD COLUMN reference_price_amount DECIMAL(20,8) NULL',
+                'ALTER TABLE `' . $table . '` ADD COLUMN reference_price_currency VARCHAR(10) NULL',
+            ];
+
+        foreach ($statements as $statement) {
+            try {
+                $this->executeUpgradeStatements([$statement], 'Import-Kompatibilitaet fuer Miner-Angebote fehlgeschlagen.');
+            } catch (\Throwable $exception) {
+                if ($this->driver === 'mysql' && str_contains(strtolower($exception->getMessage()), 'duplicate column')) {
+                    continue;
+                }
+
+                throw $exception;
+            }
+        }
+    }
+
     private function tableExists(string $table): bool
     {
         return in_array($table, $this->existingTables([$table]), true);