chore: remove stats table migration logic from ClickHouseSchemaInitializer

Not needed yet -- all deployments are under our control and can be
reset manually if the old schema is encountered.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cameleer3-server-app/src/main/java/com/cameleer3/server/app/config/ClickHouseSchemaInitializer.java

@@ -27,8 +27,6 @@ public class ClickHouseSchemaInitializer {
     @EventListener(ApplicationReadyEvent.class)
     public void initializeSchema() {
         try {
-            migrateStatsTablesIfNeeded();
-
             PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
             Resource script = resolver.getResource("classpath:clickhouse/init.sql");
 
@@ -52,36 +50,4 @@ public class ClickHouseSchemaInitializer {
             log.error("ClickHouse schema initialization failed — server will continue but ClickHouse features may not work", e);
         }
     }
-
-    /**
-     * One-time migration: stats tables originally used count()/countIf() which
-     * double-counted chunk retry duplicates. The new schema uses uniq()/uniqIf().
-     * Since AggregateFunction column types cannot be ALTERed, we must drop and
-     * let init.sql recreate them. MVs that depend on the tables are dropped first.
-     * Data rebuilds organically from new inserts via the materialized views.
-     */
-    private void migrateStatsTablesIfNeeded() {
-        String[] statsTables = {
-            "stats_1m_all", "stats_1m_app", "stats_1m_route",
-            "stats_1m_processor", "stats_1m_processor_detail"
-        };
-
-        for (String table : statsTables) {
-            try {
-                Integer oldSchema = clickHouseJdbc.queryForObject(
-                        "SELECT count() FROM system.columns " +
-                        "WHERE database = currentDatabase() AND table = '" + table + "' " +
-                        "AND name = 'total_count' AND type = 'AggregateFunction(count)'",
-                        Integer.class);
-
-                if (oldSchema != null && oldSchema > 0) {
-                    log.info("Migrating stats table '{}': dropping old count()-based schema", table);
-                    clickHouseJdbc.execute("DROP VIEW IF EXISTS " + table + "_mv");
-                    clickHouseJdbc.execute("DROP TABLE IF EXISTS " + table);
-                }
-            } catch (Exception e) {
-                log.warn("Could not check migration status for '{}': {}", table, e.getMessage());
-            }
-        }
-    }
 }