LIKE 过滤器转义修复：日志搜索含 %/_ 的输入不再被当通配符；pkg/util 新增 EscapeLike 共享助手 + 单测

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pkg/util/like.go

@@ -0,0 +1,16 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package util
+
+import "strings"
+
+var likeEscaper = strings.NewReplacer(`\`, `\\`, `%`, `\%`, `_`, `\_`)
+
+// EscapeLike escapes SQL LIKE metacharacters (\, %, _) so a user-supplied
+// value matches literally in LIKE patterns. Pair it with an explicit
+// `ESCAPE '\'` clause where the dialect has no backslash default (SQLite);
+// PostgreSQL and ClickHouse treat backslash as the default LIKE escape.
+func EscapeLike(value string) string {
+	return likeEscaper.Replace(value)
+}

pkg/util/like_test.go

@@ -0,0 +1,22 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package util
+
+import "testing"
+
+func TestEscapeLike(t *testing.T) {
+	cases := map[string]string{
+		"":            "",
+		"/my_page":    `/my\_page`,
+		"100%":        `100\%`,
+		`a\b`:         `a\\b`,
+		`%_\`:         `\%\_\\`,
+		"normal/path": "normal/path",
+	}
+	for input, want := range cases {
+		if got := EscapeLike(input); got != want {
+			t.Errorf("EscapeLike(%q) = %q, want %q", input, got, want)
+		}
+	}
+}