diff --git a/modules/mining-checker/assets/js/app.js b/modules/mining-checker/assets/js/app.js
index 7ab9ada..35e3791 100644
--- a/modules/mining-checker/assets/js/app.js
+++ b/modules/mining-checker/assets/js/app.js
@@ -998,6 +998,15 @@
       }, 12000);
 
       try {
+        const schema = await request(`${apiBase}/projects/${encodeURIComponent(key)}/schema-status`, { timeoutMs: 4000 });
+        const nextSchemaStatus = normalizeSchemaStatus(schema);
+        setSchemaStatus(nextSchemaStatus);
+        if (!nextSchemaStatus.all_present) {
+          setPayload(normalizeBootstrap(null, key));
+          setError('Mining-Checker Schema ist noch nicht initialisiert. Bitte im Tab Settings die Datenbank initialisieren.');
+          return;
+        }
+
         const data = await request(`${apiBase}/projects/${encodeURIComponent(key)}/bootstrap`, { timeoutMs: 10000 });
         const normalized = normalizeBootstrap(data, key);
         setPayload(normalized);
diff --git a/modules/mining-checker/src/Infrastructure/SchemaManager.php b/modules/mining-checker/src/Infrastructure/SchemaManager.php
index a9f7952..25f39df 100644
--- a/modules/mining-checker/src/Infrastructure/SchemaManager.php
+++ b/modules/mining-checker/src/Infrastructure/SchemaManager.php
@@ -722,7 +722,7 @@ final class SchemaManager
                     base_currency VARCHAR(10) NOT NULL,
                     quote_currency VARCHAR(10) NOT NULL,
                     rate NUMERIC(20,10) NOT NULL,
-                    provider VARCHAR(32) NOT NULL DEFAULT 'derived',
+                    provider VARCHAR(32) NOT NULL DEFAULT \'derived\',
                     created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
                     CONSTRAINT fk_mining_measurement_rates_measurement FOREIGN KEY (measurement_id) REFERENCES ' . $measurementTable . '(id) ON DELETE CASCADE,
                     CONSTRAINT uq_mining_measurement_rate_pair UNIQUE (measurement_id, base_currency, quote_currency)
@@ -737,7 +737,7 @@ final class SchemaManager
                     base_currency VARCHAR(10) NOT NULL,
                     quote_currency VARCHAR(10) NOT NULL,
                     rate DECIMAL(20,10) NOT NULL,
-                    provider VARCHAR(32) NOT NULL DEFAULT 'derived',
+                    provider VARCHAR(32) NOT NULL DEFAULT \'derived\',
                     created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
                     CONSTRAINT fk_mining_measurement_rates_measurement FOREIGN KEY (measurement_id) REFERENCES `' . $measurementTable . '`(id) ON DELETE CASCADE,
                     CONSTRAINT uq_mining_measurement_rate_pair UNIQUE (measurement_id, base_currency, quote_currency),
@@ -763,7 +763,7 @@ final class SchemaManager
                     project_key VARCHAR(64) NOT NULL,
                     payout_at TIMESTAMP NOT NULL,
                     coins_amount NUMERIC(20,6) NOT NULL,
-                    payout_currency VARCHAR(10) NOT NULL DEFAULT 'DOGE',
+                    payout_currency VARCHAR(10) NOT NULL DEFAULT \'DOGE\',
                     note TEXT,
                     created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
                     updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
@@ -777,7 +777,7 @@ final class SchemaManager
                     project_key VARCHAR(64) NOT NULL,
                     payout_at TIMESTAMP NOT NULL,
                     coins_amount DECIMAL(20,6) NOT NULL,
-                    payout_currency VARCHAR(10) NOT NULL DEFAULT 'DOGE',
+                    payout_currency VARCHAR(10) NOT NULL DEFAULT \'DOGE\',
                     note TEXT,
                     created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
                     updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
@@ -808,7 +808,7 @@ final class SchemaManager
             ? [
                 'CREATE TABLE IF NOT EXISTS ' . $fetchTable . ' (
                     id BIGSERIAL PRIMARY KEY,
-                    provider VARCHAR(32) NOT NULL DEFAULT 'currencyapi',
+                    provider VARCHAR(32) NOT NULL DEFAULT \'currencyapi\',
                     base_currency VARCHAR(10) NOT NULL,
                     rate_date DATE NOT NULL,
                     fetched_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
@@ -827,7 +827,7 @@ final class SchemaManager
             : [
                 'CREATE TABLE IF NOT EXISTS `' . $fetchTable . '` (
                     id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
-                    provider VARCHAR(32) NOT NULL DEFAULT 'currencyapi',
+                    provider VARCHAR(32) NOT NULL DEFAULT \'currencyapi\',
                     base_currency VARCHAR(10) NOT NULL,
                     rate_date DATE NOT NULL,
                     fetched_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,