[FIX] PostgreSQL support.

Author: Seiger

internal/engine/install/engine.go

@@ -1750,14 +1750,7 @@ func statusLevelForKey(status domain.SystemStatus, key string) (domain.StatusLev
 	return domain.StatusError, false
 }
 
-func testDatabaseConnection(ctx context.Context, workDir string, cfg dbConfig) (bool, string, error) {
-	raw, err := json.Marshal(cfg)
-	if err != nil {
-		return false, "", err
-	}
-	encoded := base64.StdEncoding.EncodeToString(raw)
-
-	script := `
+const dbConnectionTestScript = `
 $cfg = json_decode(base64_decode($argv[1] ?? ''), true);
 if (!is_array($cfg)) { echo json_encode(["ok"=>false,"error"=>"Invalid config"]); exit(0); }
 $type = $cfg["type"] ?? "mysql";
@@ -1782,7 +1775,7 @@ try {
     echo json_encode(["ok"=>true]); exit(0);
   }
   $dsnNoDb = match($type) {
-    "pgsql" => "pgsql:host={$host};port={$port}",
+    "pgsql" => $port > 0 ? "pgsql:host={$host};port={$port};dbname=postgres" : "pgsql:host={$host};dbname=postgres",
     "sqlsrv" => $port > 0 ? "sqlsrv:Server={$host},{$port}" : "sqlsrv:Server={$host}",
     default => "mysql:host={$host};port={$port};charset=utf8mb4",
   };
@@ -1807,6 +1800,15 @@ try {
 }
 `
 
+func testDatabaseConnection(ctx context.Context, workDir string, cfg dbConfig) (bool, string, error) {
+	raw, err := json.Marshal(cfg)
+	if err != nil {
+		return false, "", err
+	}
+	encoded := base64.StdEncoding.EncodeToString(raw)
+
+	script := dbConnectionTestScript
+
 	cmd := exec.CommandContext(ctx, "php", "-r", script, encoded)
 	if strings.TrimSpace(workDir) != "" {
 		cmd.Dir = workDir

internal/engine/install/engine_test.go

@@ -1,6 +1,9 @@
 package install
 
-import "testing"
+import (
+	"strings"
+	"testing"
+)
 
 func TestSanitizeAdminDir(t *testing.T) {
 	t.Parallel()
@@ -58,3 +61,11 @@ func TestCmpSemver(t *testing.T) {
 		t.Fatalf("cmpSemver less=%d; want <0", got)
 	}
 }
+
+func TestDbConnectionTestScriptUsesPostgresMaintenanceDb(t *testing.T) {
+	t.Parallel()
+
+	if !strings.Contains(dbConnectionTestScript, "dbname=postgres") {
+		t.Fatalf("dbConnectionTestScript does not contain PostgreSQL maintenance dbname")
+	}
+}

src/Commands/InstallCommand.php

@@ -474,6 +474,11 @@ protected function testDatabaseConnection(array $config): bool
                 // For server-based databases, try to connect without database name first
                 $configWithoutDb = $config;
                 unset($configWithoutDb['name']);
+                if ($type === 'pgsql') {
+                    // PostgreSQL requires a database name; otherwise it defaults to using the username.
+                    // Use a maintenance database for credential/host validation.
+                    $configWithoutDb['name'] = 'postgres';
+                }
                 $this->createConnection($configWithoutDb);
 
                 // If database name is provided, try to connect to it

src/Concerns/ConfiguresDatabase.php

@@ -183,6 +183,11 @@ protected function createDatabase(array $config, string $collation): bool
         // MySQL / PostgreSQL
         $configWithoutDb = $config;
         unset($configWithoutDb['name']);
+        if ($type === 'pgsql') {
+            // PostgreSQL requires a database name; otherwise it defaults to using the username.
+            // Use a maintenance database for CREATE DATABASE operations.
+            $configWithoutDb['name'] = 'postgres';
+        }
 
         try {
             $dbh = $this->createConnection($configWithoutDb);
@@ -222,4 +227,3 @@ protected function createDatabase(array $config, string $collation): bool
         }
     }
 }
-