Fixed DBInfoHelper compatibility with postgres

src/Services/Misc/DBInfoHelper.php

@@ -25,6 +25,7 @@ namespace App\Services\Misc;
 use Doctrine\DBAL\Exception;
 use Doctrine\DBAL\Connection;
 use Doctrine\DBAL\Platforms\AbstractMySQLPlatform;
+use Doctrine\DBAL\Platforms\PostgreSQLPlatform;
 use Doctrine\DBAL\Platforms\SqlitePlatform;
 use Doctrine\ORM\EntityManagerInterface;
 
@@ -54,6 +55,10 @@ class DBInfoHelper
             return 'sqlite';
         }
 
+        if ($this->connection->getDatabasePlatform() instanceof PostgreSqlPlatform) {
+            return 'postgresql';
+        }
+
         return null;
     }
 
@@ -71,6 +76,10 @@ class DBInfoHelper
             return $this->connection->fetchOne('SELECT sqlite_version()');
         }
 
+        if ($this->connection->getDatabasePlatform() instanceof PostgreSqlPlatform) {
+            return $this->connection->fetchOne('SELECT version()');
+        }
+
         return null;
     }
 
@@ -97,6 +106,14 @@ class DBInfoHelper
             }
         }
 
+        if ($this->connection->getDatabasePlatform() instanceof PostgreSqlPlatform) {
+            try {
+                return (int) $this->connection->fetchOne('SELECT pg_database_size(current_database())');
+            } catch (Exception) {
+                return null;
+            }
+        }
+
         return null;
     }
 
@@ -125,6 +142,14 @@ class DBInfoHelper
             return 'sqlite';
         }
 
+        if ($this->connection->getDatabasePlatform() instanceof PostgreSqlPlatform) {
+            try {
+                return $this->connection->fetchOne('SELECT current_user');
+            } catch (Exception) {
+                return null;
+            }
+        }
+        
         return null;
     }