fix(db): force parseTime in user-provided MySQL DSNs

A custom DatabaseURL is passed verbatim to sql.Open; without
parseTime=True the driver returns DATETIME columns as strings, which
fail to scan into time.Time fields after a v3 migration.

Closes Dvorinka/cloudreve#40 (upstream cloudreve/cloudreve#2872).

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

inventory/client.go

@@ -5,6 +5,7 @@ import (
 	rawsql "database/sql"
 	"database/sql/driver"
 	"fmt"
+	"strings"
 	"time"
 
 	"entgo.io/ent/dialect/sql"
@@ -74,7 +75,7 @@ func NewRawEntClient(l logging.Logger, config conf.ConfigProvider) (*ent.Client,
 	// If Database connection string provided, use it directly.
 	if dbConfig.DatabaseURL != "" {
 		l.Info("Connect to database with connection string")
-		client, err = sql.Open(string(confDBType), dbConfig.DatabaseURL)
+		client, err = sql.Open(string(confDBType), ensureMySQLParseTime(confDBType, dbConfig.DatabaseURL))
 	} else {
 
 		switch confDBType {
@@ -142,6 +143,25 @@ func NewRawEntClient(l logging.Logger, config conf.ConfigProvider) (*ent.Client,
 	return ent.NewClient(driverOpt), nil
 }
 
+// ensureMySQLParseTime appends parseTime=True to a user-provided MySQL DSN
+// when absent. Without it the driver returns DATETIME columns as strings,
+// which fail to scan into time.Time fields (cloudreve/cloudreve#2872).
+func ensureMySQLParseTime(dbType conf.DBType, dsn string) string {
+	if dbType != conf.MySqlDB {
+		return dsn
+	}
+	idx := strings.IndexByte(dsn, '?')
+	if idx < 0 {
+		return dsn + "?parseTime=True"
+	}
+	for _, p := range strings.Split(dsn[idx+1:], "&") {
+		if strings.HasPrefix(strings.ToLower(p), "parsetime=") {
+			return dsn
+		}
+	}
+	return dsn + "&parseTime=True"
+}
+
 type sqlite3Driver struct {
 	*sqlite.Driver
 }

inventory/mysql_dsn_test.go

@@ -0,0 +1,27 @@
+package inventory
+
+import (
+	"testing"
+
+	"github.com/cloudreve/Cloudreve/v4/pkg/conf"
+	"github.com/stretchr/testify/require"
+)
+
+func TestEnsureMySQLParseTime(t *testing.T) {
+	dsn := "user:pass@tcp(127.0.0.1:3306)/cloudreve"
+	require.Equal(t, dsn+"?parseTime=True", ensureMySQLParseTime(conf.MySqlDB, dsn))
+
+	withParams := dsn + "?charset=utf8mb4"
+	require.Equal(t, withParams+"&parseTime=True", ensureMySQLParseTime(conf.MySqlDB, withParams))
+
+	existing := dsn + "?charset=utf8mb4&parseTime=false"
+	require.Equal(t, existing, ensureMySQLParseTime(conf.MySqlDB, existing))
+
+	urlForm := "mysql://user:pass@host:3306/cloudreve?tls=true"
+	require.Equal(t, urlForm+"&parseTime=True", ensureMySQLParseTime(conf.MySqlDB, urlForm))
+
+	// Non-MySQL DSNs pass through untouched.
+	pg := "postgresql://user:pass@host:5432/cloudreve?sslmode=require"
+	require.Equal(t, pg, ensureMySQLParseTime(conf.PostgresDB, pg))
+	require.Equal(t, dsn, ensureMySQLParseTime(conf.SQLiteDB, dsn))
+}