refactor(log): simplify ClickHouse log deletion and add unit tests

Replace the per-batch ClickHouse mutation loop with a single
ALTER TABLE ... DELETE, since ClickHouse DELETE is a heavy mutation
that rewrites data parts and per-batch mutations are pathologically
slow. Add deterministic unit tests covering ClickHouse DSN handling,
main-database rejection, TTL DDL generation, log ordering, request_id
backfill, and display id assignment.

model/clickhouse_log_test.go

@@ -0,0 +1,126 @@
+package model
+
+import (
+	"os"
+	"strings"
+	"testing"
+
+	"github.com/QuantumNous/new-api/common"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestIsClickHouseDSN(t *testing.T) {
+	cases := []struct {
+		dsn  string
+		want bool
+	}{
+		{"clickhouse://default:pass@localhost:9000/logs", true},
+		{"tcp://localhost:9000/logs", true},
+		{"http://localhost:8123/logs", true},
+		{"https://localhost:8443/logs", true},
+		{"postgres://root:pass@localhost:5432/db", false},
+		{"postgresql://root:pass@localhost:5432/db", false},
+		{"root:pass@tcp(localhost:3306)/db", false},
+		{"local", false},
+		{"", false},
+	}
+	for _, c := range cases {
+		assert.Equalf(t, c.want, isClickHouseDSN(c.dsn), "dsn=%q", c.dsn)
+	}
+}
+
+func TestNormalizeClickHouseDSN(t *testing.T) {
+	// https without secure gets secure=true appended
+	normalized := normalizeClickHouseDSN("https://default:pass@localhost:8443/logs")
+	assert.Contains(t, normalized, "secure=true")
+	assert.True(t, strings.HasPrefix(normalized, "https://"))
+
+	// https that already specifies secure is left untouched
+	assert.Equal(t,
+		"https://localhost:8443/logs?secure=false",
+		normalizeClickHouseDSN("https://localhost:8443/logs?secure=false"),
+	)
+
+	// non-https schemes are returned verbatim
+	assert.Equal(t, "clickhouse://localhost:9000/logs", normalizeClickHouseDSN("clickhouse://localhost:9000/logs"))
+	assert.Equal(t, "tcp://localhost:9000/logs", normalizeClickHouseDSN("tcp://localhost:9000/logs"))
+}
+
+func TestChooseDBRejectsClickHouseForMainDatabase(t *testing.T) {
+	original, had := os.LookupEnv("SQL_DSN")
+	t.Cleanup(func() {
+		if had {
+			require.NoError(t, os.Setenv("SQL_DSN", original))
+		} else {
+			require.NoError(t, os.Unsetenv("SQL_DSN"))
+		}
+	})
+	require.NoError(t, os.Setenv("SQL_DSN", "clickhouse://default:pass@localhost:9000/logs"))
+
+	db, dbType, err := chooseDB("SQL_DSN", false)
+	require.Error(t, err)
+	assert.Nil(t, db)
+	assert.Equal(t, common.DatabaseType(""), dbType)
+	assert.Contains(t, err.Error(), "does not support ClickHouse")
+}
+
+func TestClickHouseLogTTLExpression(t *testing.T) {
+	assert.Equal(t, "", clickHouseLogTTLExpression(0))
+	assert.Equal(t, "", clickHouseLogTTLExpression(-5))
+	assert.Equal(t, "toDateTime(created_at) + INTERVAL 30 DAY DELETE", clickHouseLogTTLExpression(30))
+}
+
+func TestClickHouseLogTTLClause(t *testing.T) {
+	assert.Equal(t, "", clickHouseLogTTLClause(0))
+	assert.Equal(t, "\nTTL toDateTime(created_at) + INTERVAL 7 DAY DELETE", clickHouseLogTTLClause(7))
+}
+
+func TestClickHouseLogCreateTableSQL(t *testing.T) {
+	withoutTTL := clickHouseLogCreateTableSQL(0)
+	assert.Contains(t, withoutTTL, "CREATE TABLE IF NOT EXISTS logs")
+	assert.Contains(t, withoutTTL, "ENGINE = MergeTree()")
+	assert.Contains(t, withoutTTL, "PARTITION BY toYYYYMM(toDateTime(created_at))")
+	assert.Contains(t, withoutTTL, "ORDER BY (created_at, request_id)")
+	assert.NotContains(t, withoutTTL, "TTL ")
+
+	withTTL := clickHouseLogCreateTableSQL(30)
+	assert.Contains(t, withTTL, "ORDER BY (created_at, request_id)")
+	assert.Contains(t, withTTL, "TTL toDateTime(created_at) + INTERVAL 30 DAY DELETE")
+}
+
+func TestClickHouseCreateTableHasTTL(t *testing.T) {
+	assert.True(t, clickHouseCreateTableHasTTL("CREATE TABLE logs (...)\nTTL toDateTime(created_at) + INTERVAL 30 DAY DELETE"))
+	assert.True(t, clickHouseCreateTableHasTTL("CREATE TABLE logs (...) TTL toDateTime(created_at)"))
+	assert.False(t, clickHouseCreateTableHasTTL("CREATE TABLE logs (...)\nORDER BY (created_at, request_id)"))
+}
+
+func TestClickHouseLogOrder(t *testing.T) {
+	assert.Equal(t, "created_at desc, request_id desc", clickHouseLogOrder(""))
+	assert.Equal(t, "logs.created_at desc, logs.request_id desc", clickHouseLogOrder("logs."))
+}
+
+func TestEnsureLogRequestId(t *testing.T) {
+	empty := &Log{}
+	ensureLogRequestId(empty)
+	assert.NotEmpty(t, empty.RequestId, "empty request id should be backfilled")
+
+	existing := &Log{RequestId: "fixed-request-id"}
+	ensureLogRequestId(existing)
+	assert.Equal(t, "fixed-request-id", existing.RequestId, "existing request id must be preserved")
+
+	assert.NotPanics(t, func() { ensureLogRequestId(nil) })
+}
+
+func TestAssignDisplayLogIds(t *testing.T) {
+	logs := []*Log{{}, {}, {}}
+
+	assignDisplayLogIds(logs, 0)
+	assert.Equal(t, []int{1, 2, 3}, []int{logs[0].Id, logs[1].Id, logs[2].Id})
+
+	assignDisplayLogIds(logs, 20)
+	assert.Equal(t, []int{21, 22, 23}, []int{logs[0].Id, logs[1].Id, logs[2].Id})
+
+	assert.NotPanics(t, func() { assignDisplayLogIds(nil, 0) })
+}