Remove continual tasks (CT) feature

Remove the continual tasks feature from Materialize. CTs were an
experimental feature that is no longer needed.

Changes:
* Remove CT SQL syntax from parser
* Remove CT catalog items, builtins, and system tables
* Remove CT rendering in compute
* Add catalog migration v81→v82 that panics if CTs are found
* Remove BuiltinsConfig (empty after CT removal)
* Add platform check for CT migration verification
* Clean up related comments and dead code

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

Author: antiguru

console/types/materialize.d.ts

@@ -1047,19 +1047,6 @@ export interface MzConsoleClusterUtilizationOverview {
   size: string | null;
 }
 
-export interface MzContinualTasks {
-  cluster_id: Generated<string>;
-  create_sql: Generated<string>;
-  definition: Generated<string>;
-  id: Generated<string>;
-  name: Generated<string>;
-  oid: Generated<number>;
-  owner_id: Generated<string>;
-  privileges: Generated<string[]>;
-  redacted_create_sql: Generated<string>;
-  schema_id: Generated<string>;
-}
-
 export interface MzDatabases {
   /**
    * Materialize's unique ID for the database.
@@ -3007,15 +2994,6 @@ export interface MzShowConnections {
   type: string;
 }
 
-export interface MzShowContinualTasks {
-  cluster: string;
-  cluster_id: string;
-  comment: string;
-  id: string;
-  name: string;
-  schema_id: string;
-}
-
 export interface MzShowDatabasePrivileges {
   /**
    * The role that the privilege was granted to.
@@ -4302,7 +4280,6 @@ export interface DB {
   mz_compute_operator_hydration_statuses_per_worker: MzComputeOperatorHydrationStatusesPerWorker;
   mz_connections: MzConnections;
   mz_console_cluster_utilization_overview: MzConsoleClusterUtilizationOverview;
-  mz_continual_tasks: MzContinualTasks;
   mz_databases: MzDatabases;
   mz_dataflow_addresses: MzDataflowAddresses;
   mz_dataflow_addresses_per_worker: MzDataflowAddressesPerWorker;
@@ -4415,7 +4392,6 @@ export interface DB {
   mz_show_clusters: MzShowClusters;
   mz_show_columns: MzShowColumns;
   mz_show_connections: MzShowConnections;
-  mz_show_continual_tasks: MzShowContinualTasks;
   mz_show_database_privileges: MzShowDatabasePrivileges;
   mz_show_databases: MzShowDatabases;
   mz_show_default_privileges: MzShowDefaultPrivileges;

doc/developer/generated/adapter/continual_task.md

@@ -1393,7 +1393,6 @@ The `mz_webhook_sources` table contains a row for each webhook source in the sys
 <!-- RELATION_SPEC_UNDOCUMENTED mz_internal.mz_catalog_raw -->
 <!-- RELATION_SPEC_UNDOCUMENTED mz_internal.mz_cluster_workload_classes -->
 <!-- RELATION_SPEC_UNDOCUMENTED mz_internal.mz_compute_error_counts_raw_unified -->
-<!-- RELATION_SPEC_UNDOCUMENTED mz_internal.mz_continual_tasks -->
 <!-- RELATION_SPEC_UNDOCUMENTED mz_internal.mz_recent_activity_log_redacted -->
 <!-- RELATION_SPEC_UNDOCUMENTED mz_internal.mz_recent_activity_log_thinned -->
 <!-- RELATION_SPEC_UNDOCUMENTED mz_internal.mz_aggregates -->
@@ -1406,7 +1405,6 @@ The `mz_webhook_sources` table contains a row for each webhook source in the sys
 <!-- RELATION_SPEC_UNDOCUMENTED mz_internal.mz_show_cluster_replicas -->
 <!-- RELATION_SPEC_UNDOCUMENTED mz_internal.mz_show_columns -->
 <!-- RELATION_SPEC_UNDOCUMENTED mz_internal.mz_show_connections -->
-<!-- RELATION_SPEC_UNDOCUMENTED mz_internal.mz_show_continual_tasks -->
 <!-- RELATION_SPEC_UNDOCUMENTED mz_internal.mz_show_databases -->
 <!-- RELATION_SPEC_UNDOCUMENTED mz_internal.mz_show_indexes -->
 <!-- RELATION_SPEC_UNDOCUMENTED mz_internal.mz_show_materialized_views -->

doc/developer/generated/adapter/coord/sequencer/inner/create_continual_task.md

@@ -79,9 +79,6 @@ def get_minimal_system_parameters(
         "enable_compute_correction_v2": "true",
         "enable_compute_logical_backpressure": "true",
         "enable_connection_validation_syntax": "true",
-        "enable_continual_task_create": "true",
-        "enable_continual_task_retain": "true",
-        "enable_continual_task_transform": "true",
         "enable_copy_to_expr": "true",
         "enable_copy_from_remote": "true",
         "enable_create_table_from_source": "true",
@@ -629,7 +626,6 @@ def get_default_system_parameters(
     "with_0dt_caught_up_check_cutoff",
     "enable_0dt_caught_up_replica_status_check",
     "plan_insights_notice_fast_path_clusters_optimize_duration",
-    "enable_continual_task_builtins",
     "enable_expression_cache",
     "mz_metrics_lgalloc_map_refresh_interval",
     "mz_metrics_lgalloc_refresh_interval",

doc/developer/generated/compute/render/continual_task.md

@@ -1764,7 +1764,6 @@ def __init__(
             "enable_statement_lifecycle_logging",
             "enable_introspection_subscribes",
             "plan_insights_notice_fast_path_clusters_optimize_duration",
-            "enable_continual_task_builtins",
             "enable_expression_cache",
             "enable_multi_replica_sources",
             "enable_password_auth",

doc/user/content/reference/system-catalog/mz_internal.md

@@ -140,7 +140,6 @@ fn in_cluster(stmt: &Statement<mz_sql_parser::ast::Raw>) -> Option<String> {
         Statement::CreateSource(src) => src.in_cluster.clone(),
         Statement::CreateWebhookSource(src) => src.in_cluster.clone(),
         Statement::CreateSink(src) => src.in_cluster.clone(),
-        Statement::CreateContinualTask(ct) => ct.in_cluster.clone(),
         _ => None,
     };
 

misc/python/materialize/checks/all_checks/continual_task.py

@@ -96,13 +96,6 @@ pub const PLAN_INSIGHTS_NOTICE_FAST_PATH_CLUSTERS_OPTIMIZE_DURATION: Config<Dura
     "Enable plan insights fast path clusters calculation if the optimize step took less than this duration.",
 );
 
-/// Whether to create system builtin continual tasks on boot.
-pub const ENABLE_CONTINUAL_TASK_BUILTINS: Config<bool> = Config::new(
-    "enable_continual_task_builtins",
-    false,
-    "Create system builtin continual tasks on boot.",
-);
-
 /// Whether to use an expression cache on boot.
 pub const ENABLE_EXPRESSION_CACHE: Config<bool> = Config::new(
     "enable_expression_cache",
@@ -229,7 +222,6 @@ pub fn all_dyncfgs(configs: ConfigSet) -> ConfigSet {
         .add(&ENABLE_INTROSPECTION_SUBSCRIBES)
         .add(&ENABLE_FRONTEND_SUBSCRIBES)
         .add(&PLAN_INSIGHTS_NOTICE_FAST_PATH_CLUSTERS_OPTIMIZE_DURATION)
-        .add(&ENABLE_CONTINUAL_TASK_BUILTINS)
         .add(&ENABLE_EXPRESSION_CACHE)
         .add(&ENABLE_MULTI_REPLICA_SOURCES)
         .add(&ENABLE_PASSWORD_AUTH)