fix(webapp): keep log projection writes off read replicas

Author: carderne

apps/webapp/app/env.server.ts

@@ -2075,8 +2075,8 @@ const EnvironmentSchema = z
     // Keep reads on v1 until the scheduled v2 projector has enough history.
     LOGS_SEARCH_TABLE_VERSION: z.enum(["v1", "v2"]).default("v1"),
 
-    // Scheduled logs-search projection. Disabled by default. LOGS_CLICKHOUSE_URL must reach both
-    // the task_events_v2 source and task_events_search_v2 destination tables.
+    // Scheduled logs-search projection. Disabled by default. LOGS_CLICKHOUSE_URL, or the
+    // CLICKHOUSE_URL fallback, must reach both source and destination tables and allow writes.
     LOGS_SEARCH_PROJECTOR_ENABLED: BoolEnv.default(false),
     LOGS_SEARCH_PROJECTOR_PREVIEW_ENABLED: BoolEnv.default(false),
     LOGS_SEARCH_PROJECTOR_MAX_WINDOWS_PER_TICK: z.coerce.number().int().min(1).max(20).default(5),
@@ -2105,10 +2105,7 @@ const EnvironmentSchema = z
     AI_FEATURES_ENABLED: z.string().default("0"),
 
     // Logs page ClickHouse URL (for logs queries)
-    LOGS_CLICKHOUSE_URL: z
-      .string()
-      .optional()
-      .transform((v) => v ?? process.env.CLICKHOUSE_READER_URL ?? process.env.CLICKHOUSE_URL),
+    LOGS_CLICKHOUSE_URL: z.string().optional(),
 
     // Query page ClickHouse limits (for TSQL queries)
     QUERY_CLICKHOUSE_URL: z

apps/webapp/app/services/clickhouse/clickhouseFactory.server.ts

@@ -38,11 +38,7 @@ const defaultLogsClickhouseClient = singleton(
 );
 
 function initializeLogsSearchProjectorClickhouseClient() {
-  if (!env.LOGS_CLICKHOUSE_URL) {
-    throw new Error("LOGS_CLICKHOUSE_URL is not set");
-  }
-
-  const url = new URL(env.LOGS_CLICKHOUSE_URL);
+  const url = new URL(env.LOGS_CLICKHOUSE_URL ?? env.CLICKHOUSE_URL);
   url.searchParams.delete("secure");
 
   return new ClickHouse({
@@ -84,11 +80,7 @@ function getLogsListClickhouseSettings() {
 }
 
 function initializeLogsClickhouseClient() {
-  if (!env.LOGS_CLICKHOUSE_URL) {
-    throw new Error("LOGS_CLICKHOUSE_URL is not set");
-  }
-
-  const url = new URL(env.LOGS_CLICKHOUSE_URL);
+  const url = new URL(env.LOGS_CLICKHOUSE_URL ?? env.CLICKHOUSE_READER_URL ?? env.CLICKHOUSE_URL);
   url.searchParams.delete("secure");
 
   return new ClickHouse({