fix(database): stop noisy per-startup errors in the Postgres server log

Two statements failed server-side on every panel start after a SQLite to
Postgres migration, flooding the postgres log even though the Go side
suppressed them:

- resyncPostgresSequences issued SELECT MAX(id) against client_inbounds,
  whose composite primary key has no id column; Postgres validates the
  SELECT list at parse time, so the WHERE pg_get_serial_sequence(...) guard
  never got a chance to no-op it. Skip models whose GORM schema maps no id
  column before issuing the statement.

- AutoMigrate detects existing columns via information_schema filtered by
  table_catalog = CURRENT_DATABASE(), which misdetects on some setups and
  re-issues ALTER TABLE ... ADD for columns that already exist. HasColumn/
  HasIndex query without that filter and are reliable (the existing
  duplicate-column suppressor depends on exactly that), so skip AutoMigrate
  outright when the table, every column, and every index already exist.

Closes #5665

internal/database/db_settled_test.go

@@ -0,0 +1,57 @@
+package database
+
+import (
+	"path/filepath"
+	"testing"
+
+	"github.com/mhsanaei/3x-ui/v3/internal/database/model"
+)
+
+// Locks the #5665 guard: composite-PK client_inbounds has no id column, so the
+// sequence-reset SQL must never be issued for it.
+func TestTableWithIdColumn_SkipsCompositeKeyModels(t *testing.T) {
+	if err := InitDB(filepath.Join(t.TempDir(), "x-ui.db")); err != nil {
+		t.Fatalf("InitDB: %v", err)
+	}
+	t.Cleanup(func() { _ = CloseDB() })
+
+	if table, ok := tableWithIdColumn(db, &model.ClientInbound{}); ok {
+		t.Errorf("ClientInbound (table %q) has no id column but was not skipped", table)
+	}
+	table, ok := tableWithIdColumn(db, &model.Inbound{})
+	if !ok {
+		t.Fatal("Inbound has an id column but was reported as skippable")
+	}
+	if table != "inbounds" {
+		t.Errorf("Inbound table = %q, want inbounds", table)
+	}
+}
+
+// Exercises the #5665 AutoMigrate skip on SQLite (the check is dialect-agnostic):
+// settled after InitDB, not settled with a missing column or table.
+func TestPostgresModelSettled_TracksSchemaPresence(t *testing.T) {
+	if err := InitDB(filepath.Join(t.TempDir(), "x-ui.db")); err != nil {
+		t.Fatalf("InitDB: %v", err)
+	}
+	t.Cleanup(func() { _ = CloseDB() })
+
+	for _, mdl := range []any{&model.ClientRecord{}, &model.ClientGroup{}, &model.ClientInbound{}} {
+		if !postgresModelSettled(mdl) {
+			t.Errorf("%T not settled right after InitDB", mdl)
+		}
+	}
+
+	if err := db.Migrator().DropColumn(&model.ClientGroup{}, "reset_up"); err != nil {
+		t.Fatalf("drop column: %v", err)
+	}
+	if postgresModelSettled(&model.ClientGroup{}) {
+		t.Error("ClientGroup settled despite missing reset_up column")
+	}
+
+	if err := db.Migrator().DropTable(&model.ClientGroup{}); err != nil {
+		t.Fatalf("drop table: %v", err)
+	}
+	if postgresModelSettled(&model.ClientGroup{}) {
+		t.Error("ClientGroup settled despite missing table")
+	}
+}