feat: add billing header rectifier to strip x-anthropic-billing-header from system prompt

Claude Code client v2.1.36+ injects x-anthropic-billing-header as a text
block inside the request body's system content array. Non-native Anthropic
upstreams (e.g. Amazon Bedrock) reject this with 400. This proactive
rectifier strips these blocks before forwarding, with a system settings
toggle (default: enabled).

- New rectifier module with regex-based detection
- Full backend wiring: schema, repository, cache, validation, action
- UI toggle in system settings form with i18n (5 locales)
- SpecialSetting audit trail for removed blocks
- 14 unit tests covering all edge cases
- Drizzle migration for new boolean column

drizzle/0067_gorgeous_mulholland_black.sql

@@ -0,0 +1 @@
+ALTER TABLE "system_settings" ADD COLUMN "enable_billing_header_rectifier" boolean DEFAULT true NOT NULL;

drizzle/meta/0067_snapshot.json

@@ -0,0 +1,2990 @@
+{
+  "id": "c4820501-71eb-4492-b9cb-dd19c5def277",
+  "prevId": "6acf6a64-a2b1-41a1-aeda-ee47a6304e29",
+  "version": "7",
+  "dialect": "postgresql",
+  "tables": {
+    "public.error_rules": {
+      "name": "error_rules",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "pattern": {
+          "name": "pattern",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "match_type": {
+          "name": "match_type",
+          "type": "varchar(20)",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "'regex'"
+        },
+        "category": {
+          "name": "category",
+          "type": "varchar(50)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "description": {
+          "name": "description",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "override_response": {
+          "name": "override_response",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "override_status_code": {
+          "name": "override_status_code",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "is_enabled": {
+          "name": "is_enabled",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": true,
+          "default": true
+        },
+        "is_default": {
+          "name": "is_default",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": true,
+          "default": false
+        },
+        "priority": {
+          "name": "priority",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "default": 0
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {
+        "idx_error_rules_enabled": {
+          "name": "idx_error_rules_enabled",
+          "columns": [
+            {
+              "expression": "is_enabled",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            },
+            {
+              "expression": "priority",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "unique_pattern": {
+          "name": "unique_pattern",
+          "columns": [
+            {
+              "expression": "pattern",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": true,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_category": {
+          "name": "idx_category",
+          "columns": [
+            {
+              "expression": "category",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_match_type": {
+          "name": "idx_match_type",
+          "columns": [
+            {
+              "expression": "match_type",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        }
+      },
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.keys": {
+      "name": "keys",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "key": {
+          "name": "key",
+          "type": "varchar",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "name": {
+          "name": "name",
+          "type": "varchar",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "is_enabled": {
+          "name": "is_enabled",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": true
+        },
+        "expires_at": {
+          "name": "expires_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "can_login_web_ui": {
+          "name": "can_login_web_ui",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": false
+        },
+        "limit_5h_usd": {
+          "name": "limit_5h_usd",
+          "type": "numeric(10, 2)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "limit_daily_usd": {
+          "name": "limit_daily_usd",
+          "type": "numeric(10, 2)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "daily_reset_mode": {
+          "name": "daily_reset_mode",
+          "type": "daily_reset_mode",
+          "typeSchema": "public",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "'fixed'"
+        },
+        "daily_reset_time": {
+          "name": "daily_reset_time",
+          "type": "varchar(5)",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "'00:00'"
+        },
+        "limit_weekly_usd": {
+          "name": "limit_weekly_usd",
+          "type": "numeric(10, 2)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "limit_monthly_usd": {
+          "name": "limit_monthly_usd",
+          "type": "numeric(10, 2)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "limit_total_usd": {
+          "name": "limit_total_usd",
+          "type": "numeric(10, 2)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "limit_concurrent_sessions": {
+          "name": "limit_concurrent_sessions",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "default": 0
+        },
+        "provider_group": {
+          "name": "provider_group",
+          "type": "varchar(200)",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'default'"
+        },
+        "cache_ttl_preference": {
+          "name": "cache_ttl_preference",
+          "type": "varchar(10)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "deleted_at": {
+          "name": "deleted_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false
+        }
+      },
+      "indexes": {
+        "idx_keys_user_id": {
+          "name": "idx_keys_user_id",
+          "columns": [
+            {
+              "expression": "user_id",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_keys_created_at": {
+          "name": "idx_keys_created_at",
+          "columns": [
+            {
+              "expression": "created_at",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_keys_deleted_at": {
+          "name": "idx_keys_deleted_at",
+          "columns": [
+            {
+              "expression": "deleted_at",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        }
+      },
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.message_request": {
+      "name": "message_request",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "provider_id": {
+          "name": "provider_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "key": {
+          "name": "key",
+          "type": "varchar",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "model": {
+          "name": "model",
+          "type": "varchar(128)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "duration_ms": {
+          "name": "duration_ms",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "cost_usd": {
+          "name": "cost_usd",
+          "type": "numeric(21, 15)",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'0'"
+        },
+        "cost_multiplier": {
+          "name": "cost_multiplier",
+          "type": "numeric(10, 4)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "session_id": {
+          "name": "session_id",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "request_sequence": {
+          "name": "request_sequence",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "default": 1
+        },
+        "provider_chain": {
+          "name": "provider_chain",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "status_code": {
+          "name": "status_code",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "api_type": {
+          "name": "api_type",
+          "type": "varchar(20)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "endpoint": {
+          "name": "endpoint",
+          "type": "varchar(256)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "original_model": {
+          "name": "original_model",
+          "type": "varchar(128)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "input_tokens": {
+          "name": "input_tokens",
+          "type": "bigint",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "output_tokens": {
+          "name": "output_tokens",
+          "type": "bigint",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "ttfb_ms": {
+          "name": "ttfb_ms",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "cache_creation_input_tokens": {
+          "name": "cache_creation_input_tokens",
+          "type": "bigint",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "cache_read_input_tokens": {
+          "name": "cache_read_input_tokens",
+          "type": "bigint",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "cache_creation_5m_input_tokens": {
+          "name": "cache_creation_5m_input_tokens",
+          "type": "bigint",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "cache_creation_1h_input_tokens": {
+          "name": "cache_creation_1h_input_tokens",
+          "type": "bigint",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "cache_ttl_applied": {
+          "name": "cache_ttl_applied",
+          "type": "varchar(10)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "context_1m_applied": {
+          "name": "context_1m_applied",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": false
+        },
+        "special_settings": {
+          "name": "special_settings",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "error_message": {
+          "name": "error_message",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "error_stack": {
+          "name": "error_stack",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "error_cause": {
+          "name": "error_cause",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "blocked_by": {
+          "name": "blocked_by",
+          "type": "varchar(50)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "blocked_reason": {
+          "name": "blocked_reason",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "user_agent": {
+          "name": "user_agent",
+          "type": "varchar(512)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "messages_count": {
+          "name": "messages_count",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "deleted_at": {
+          "name": "deleted_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false
+        }
+      },
+      "indexes": {
+        "idx_message_request_user_date_cost": {
+          "name": "idx_message_request_user_date_cost",
+          "columns": [
+            {
+              "expression": "user_id",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            },
+            {
+              "expression": "created_at",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            },
+            {
+              "expression": "cost_usd",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "where": "\"message_request\".\"deleted_at\" IS NULL",
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_message_request_user_query": {
+          "name": "idx_message_request_user_query",
+          "columns": [
+            {
+              "expression": "user_id",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            },
+            {
+              "expression": "created_at",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "where": "\"message_request\".\"deleted_at\" IS NULL",
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_message_request_session_id": {
+          "name": "idx_message_request_session_id",
+          "columns": [
+            {
+              "expression": "session_id",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "where": "\"message_request\".\"deleted_at\" IS NULL",
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_message_request_session_id_prefix": {
+          "name": "idx_message_request_session_id_prefix",
+          "columns": [
+            {
+              "expression": "\"session_id\" varchar_pattern_ops",
+              "asc": true,
+              "isExpression": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "where": "\"message_request\".\"deleted_at\" IS NULL AND (\"message_request\".\"blocked_by\" IS NULL OR \"message_request\".\"blocked_by\" <> 'warmup')",
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_message_request_session_seq": {
+          "name": "idx_message_request_session_seq",
+          "columns": [
+            {
+              "expression": "session_id",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            },
+            {
+              "expression": "request_sequence",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "where": "\"message_request\".\"deleted_at\" IS NULL",
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_message_request_endpoint": {
+          "name": "idx_message_request_endpoint",
+          "columns": [
+            {
+              "expression": "endpoint",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "where": "\"message_request\".\"deleted_at\" IS NULL",
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_message_request_blocked_by": {
+          "name": "idx_message_request_blocked_by",
+          "columns": [
+            {
+              "expression": "blocked_by",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "where": "\"message_request\".\"deleted_at\" IS NULL",
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_message_request_provider_id": {
+          "name": "idx_message_request_provider_id",
+          "columns": [
+            {
+              "expression": "provider_id",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_message_request_user_id": {
+          "name": "idx_message_request_user_id",
+          "columns": [
+            {
+              "expression": "user_id",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_message_request_key": {
+          "name": "idx_message_request_key",
+          "columns": [
+            {
+              "expression": "key",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_message_request_created_at": {
+          "name": "idx_message_request_created_at",
+          "columns": [
+            {
+              "expression": "created_at",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_message_request_deleted_at": {
+          "name": "idx_message_request_deleted_at",
+          "columns": [
+            {
+              "expression": "deleted_at",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        }
+      },
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.model_prices": {
+      "name": "model_prices",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "model_name": {
+          "name": "model_name",
+          "type": "varchar",
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+        "enable_client_version_check": {
+          "name": "enable_client_version_check",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": true,
+          "default": false
+        },
+        "verbose_provider_error": {
+          "name": "verbose_provider_error",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": true,
+          "default": false
+        },
+        "enable_http2": {
+          "name": "enable_http2",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": true,
+          "default": false
+        },
+        "intercept_anthropic_warmup_requests": {
+          "name": "intercept_anthropic_warmup_requests",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": true,
+          "default": false
+        },
+        "enable_thinking_signature_rectifier": {
+          "name": "enable_thinking_signature_rectifier",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": true,
+          "default": true
+        },
+        "enable_thinking_budget_rectifier": {
+          "name": "enable_thinking_budget_rectifier",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": true,
+          "default": true
+        },
+        "enable_billing_header_rectifier": {
+          "name": "enable_billing_header_rectifier",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": true,
+          "default": true
+        },
+        "enable_codex_session_id_completion": {
+          "name": "enable_codex_session_id_completion",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": true,
+          "default": true
+        },
+        "enable_claude_metadata_user_id_injection": {
+          "name": "enable_claude_metadata_user_id_injection",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": true,
+          "default": true
+        },
+        "enable_response_fixer": {
+          "name": "enable_response_fixer",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": true,
+          "default": true
+        },
+        "response_fixer_config": {
+          "name": "response_fixer_config",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'{\"fixTruncatedJson\":true,\"fixSseFormat\":true,\"fixEncoding\":true,\"maxJsonDepth\":200,\"maxFixSize\":1048576}'::jsonb"
+        },
+        "quota_db_refresh_interval_seconds": {
+          "name": "quota_db_refresh_interval_seconds",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "default": 10
+        },
+        "quota_lease_percent_5h": {
+          "name": "quota_lease_percent_5h",
+          "type": "numeric(5, 4)",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'0.05'"
+        },
+        "quota_lease_percent_daily": {
+          "name": "quota_lease_percent_daily",
+          "type": "numeric(5, 4)",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'0.05'"
+        },
+        "quota_lease_percent_weekly": {
+          "name": "quota_lease_percent_weekly",
+          "type": "numeric(5, 4)",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'0.05'"
+        },
+        "quota_lease_percent_monthly": {
+          "name": "quota_lease_percent_monthly",
+          "type": "numeric(5, 4)",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'0.05'"
+        },
+        "quota_lease_cap_usd": {
+          "name": "quota_lease_cap_usd",
+          "type": "numeric(10, 2)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.users": {
+      "name": "users",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "name": {
+          "name": "name",
+          "type": "varchar",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "description": {
+          "name": "description",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "role": {
+          "name": "role",
+          "type": "varchar",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'user'"
+        },
+        "rpm_limit": {
+          "name": "rpm_limit",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "daily_limit_usd": {
+          "name": "daily_limit_usd",
+          "type": "numeric(10, 2)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "provider_group": {
+          "name": "provider_group",
+          "type": "varchar(200)",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'default'"
+        },
+        "tags": {
+          "name": "tags",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'[]'::jsonb"
+        },
+        "limit_5h_usd": {
+          "name": "limit_5h_usd",
+          "type": "numeric(10, 2)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "limit_weekly_usd": {
+          "name": "limit_weekly_usd",
+          "type": "numeric(10, 2)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "limit_monthly_usd": {
+          "name": "limit_monthly_usd",
+          "type": "numeric(10, 2)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "limit_total_usd": {
+          "name": "limit_total_usd",
+          "type": "numeric(10, 2)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "limit_concurrent_sessions": {
+          "name": "limit_concurrent_sessions",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "daily_reset_mode": {
+          "name": "daily_reset_mode",
+          "type": "daily_reset_mode",
+          "typeSchema": "public",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "'fixed'"
+        },
+        "daily_reset_time": {
+          "name": "daily_reset_time",
+          "type": "varchar(5)",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "'00:00'"
+        },
+        "is_enabled": {
+          "name": "is_enabled",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": true,
+          "default": true
+        },
+        "expires_at": {
+          "name": "expires_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "allowed_clients": {
+          "name": "allowed_clients",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'[]'::jsonb"
+        },
+        "allowed_models": {
+          "name": "allowed_models",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'[]'::jsonb"
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "deleted_at": {
+          "name": "deleted_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false
+        }
+      },
+      "indexes": {
+        "idx_users_active_role_sort": {
+          "name": "idx_users_active_role_sort",
+          "columns": [
+            {
+              "expression": "deleted_at",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            },
+            {
+              "expression": "role",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            },
+            {
+              "expression": "id",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "where": "\"users\".\"deleted_at\" IS NULL",
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_users_enabled_expires_at": {
+          "name": "idx_users_enabled_expires_at",
+          "columns": [
+            {
+              "expression": "is_enabled",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            },
+            {
+              "expression": "expires_at",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "where": "\"users\".\"deleted_at\" IS NULL",
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_users_created_at": {
+          "name": "idx_users_created_at",
+          "columns": [
+            {
+              "expression": "created_at",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_users_deleted_at": {
+          "name": "idx_users_deleted_at",
+          "columns": [
+            {
+              "expression": "deleted_at",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        }
+      },
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.webhook_targets": {
+      "name": "webhook_targets",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "name": {
+          "name": "name",
+          "type": "varchar(100)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "provider_type": {
+          "name": "provider_type",
+          "type": "webhook_provider_type",
+          "typeSchema": "public",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "webhook_url": {
+          "name": "webhook_url",
+          "type": "varchar(1024)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "telegram_bot_token": {
+          "name": "telegram_bot_token",
+          "type": "varchar(256)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "telegram_chat_id": {
+          "name": "telegram_chat_id",
+          "type": "varchar(64)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "dingtalk_secret": {
+          "name": "dingtalk_secret",
+          "type": "varchar(256)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "custom_template": {
+          "name": "custom_template",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "custom_headers": {
+          "name": "custom_headers",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "proxy_url": {
+          "name": "proxy_url",
+          "type": "varchar(512)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "proxy_fallback_to_direct": {
+          "name": "proxy_fallback_to_direct",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": false
+        },
+        "is_enabled": {
+          "name": "is_enabled",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": true,
+          "default": true
+        },
+        "last_test_at": {
+          "name": "last_test_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "last_test_result": {
+          "name": "last_test_result",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp with time zone",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    }
+  },
+  "enums": {
+    "public.daily_reset_mode": {
+      "name": "daily_reset_mode",
+      "schema": "public",
+      "values": [
+        "fixed",
+        "rolling"
+      ]
+    },
+    "public.notification_type": {
+      "name": "notification_type",
+      "schema": "public",
+      "values": [
+        "circuit_breaker",
+        "daily_leaderboard",
+        "cost_alert"
+      ]
+    },
+    "public.webhook_provider_type": {
+      "name": "webhook_provider_type",
+      "schema": "public",
+      "values": [
+        "wechat",
+        "feishu",
+        "dingtalk",
+        "telegram",
+        "custom"
+      ]
+    }
+  },
+  "schemas": {},
+  "sequences": {},
+  "roles": {},
+  "policies": {},
+  "views": {},
+  "_meta": {
+    "columns": {},
+    "schemas": {},
+    "tables": {}
+  }
+}

drizzle/meta/_journal.json

@@ -470,6 +470,13 @@
       "when": 1770728835628,
       "tag": "0066_hot_mauler",
       "breakpoints": true
+    },
+    {
+      "idx": 67,
+      "version": "7",
+      "when": 1771045274665,
+      "tag": "0067_gorgeous_mulholland_black",
+      "breakpoints": true
     }
   ]
 }

messages/en/settings/config.json

@@ -53,6 +53,8 @@
     "enableThinkingSignatureRectifierDesc": "When Anthropic providers return thinking signature incompatibility or invalid request errors, automatically removes incompatible thinking blocks and retries once against the same provider (enabled by default).",
     "enableThinkingBudgetRectifier": "Enable Thinking Budget Rectifier",
     "enableThinkingBudgetRectifierDesc": "When Anthropic providers return budget_tokens < 1024 errors, automatically sets thinking budget to maximum (32000) and max_tokens to 64000 if needed, then retries once (enabled by default).",
+    "enableBillingHeaderRectifier": "Enable Billing Header Rectifier",
+    "enableBillingHeaderRectifierDesc": "Proactively removes x-anthropic-billing-header text blocks injected by Claude Code client into the system prompt, preventing Amazon Bedrock and other non-native Anthropic upstreams from returning 400 errors (enabled by default).",
     "enableCodexSessionIdCompletion": "Enable Codex Session ID Completion",
     "enableCodexSessionIdCompletionDesc": "When Codex requests provide only one of session_id (header) or prompt_cache_key (body), automatically completes the other. If both are missing, generates a UUID v7 session id and reuses it stably within the same conversation.",
     "enableClaudeMetadataUserIdInjection": "Enable Claude metadata.user_id Injection",

messages/ja/settings/config.json

@@ -53,6 +53,8 @@
     "enableThinkingSignatureRectifierDesc": "Anthropic プロバイダーで thinking 署名の不整合や不正なリクエストエラーが発生した場合、thinking 関連ブロックを削除して同一プロバイダーへ1回だけ再試行します（既定で有効）。",
     "enableThinkingBudgetRectifier": "thinking 予算整流を有効化",
     "enableThinkingBudgetRectifierDesc": "Anthropic プロバイダーで budget_tokens < 1024 エラーが発生した場合、thinking 予算を最大値（32000）に設定し、必要に応じて max_tokens を 64000 に設定して1回だけ再試行します（既定で有効）。",
+    "enableBillingHeaderRectifier": "課金ヘッダー整流を有効化",
+    "enableBillingHeaderRectifierDesc": "Claude Code クライアントが system プロンプトに注入する x-anthropic-billing-header テキストブロックを事前に削除し、Amazon Bedrock などの非ネイティブ Anthropic 上流による 400 エラーを防止します（既定で有効）。",
     "enableCodexSessionIdCompletion": "Codex セッションID補完を有効化",
     "enableCodexSessionIdCompletionDesc": "Codex リクエストで session_id（ヘッダー）または prompt_cache_key（ボディ）のどちらか一方しか提供されない場合に、欠けている方を自動補完します。両方ない場合は UUID v7 のセッションIDを生成し、同一対話内で安定して再利用します。",
     "enableClaudeMetadataUserIdInjection": "Claude metadata.user_id 注入を有効化",

messages/ru/settings/config.json

@@ -53,6 +53,8 @@
     "enableThinkingSignatureRectifierDesc": "Если Anthropic-провайдер возвращает ошибку несовместимой подписи thinking или некорректного запроса, автоматически удаляет несовместимые thinking-блоки и повторяет запрос один раз к тому же провайдеру (включено по умолчанию).",
     "enableThinkingBudgetRectifier": "Включить исправление thinking-budget",
     "enableThinkingBudgetRectifierDesc": "Если Anthropic-провайдер возвращает ошибку budget_tokens < 1024, автоматически устанавливает thinking budget на максимум (32000) и при необходимости max_tokens на 64000, затем повторяет запрос один раз (включено по умолчанию).",
+    "enableBillingHeaderRectifier": "Включить исправление billing-заголовка",
+    "enableBillingHeaderRectifierDesc": "Проактивно удаляет текстовые блоки x-anthropic-billing-header, добавленные клиентом Claude Code в системный промпт, предотвращая ошибки 400 от Amazon Bedrock и других не-Anthropic провайдеров (включено по умолчанию).",
     "enableCodexSessionIdCompletion": "Включить дополнение Session ID для Codex",
     "enableCodexSessionIdCompletionDesc": "Если в Codex-запросе присутствует только session_id (в заголовках) или prompt_cache_key (в теле), автоматически дополняет отсутствующее поле. Если оба отсутствуют, генерирует UUID v7 и стабильно переиспользует его в рамках одного диалога.",
     "enableClaudeMetadataUserIdInjection": "Включить инъекцию Claude metadata.user_id",

messages/zh-CN/settings/config.json

@@ -42,6 +42,8 @@
     "enableThinkingSignatureRectifierDesc": "当 Anthropic 类型供应商返回 thinking 签名不兼容或非法请求等错误时，自动移除不兼容的 thinking 相关块并对同一供应商重试一次（默认开启）。",
     "enableThinkingBudgetRectifier": "启用 thinking 预算整流器",
     "enableThinkingBudgetRectifierDesc": "当 Anthropic 类型供应商返回 budget_tokens < 1024 错误时，自动将 thinking 预算设为最大值（32000），并在需要时将 max_tokens 设为 64000，然后重试一次（默认开启）。",
+    "enableBillingHeaderRectifier": "启用计费标头整流器",
+    "enableBillingHeaderRectifierDesc": "主动移除 Claude Code 客户端注入到 system 提示中的 x-anthropic-billing-header 文本块，防止 Amazon Bedrock 等非原生 Anthropic 上游返回 400 错误（默认开启）。",
     "enableCodexSessionIdCompletion": "启用 Codex Session ID 补全",
     "enableCodexSessionIdCompletionDesc": "当 Codex 请求仅提供 session_id（请求头）或 prompt_cache_key（请求体）之一时，自动补全另一个；若两者均缺失，则生成 UUID v7 会话 ID，并在同一对话内稳定复用。",
     "enableClaudeMetadataUserIdInjection": "启用 Claude metadata.user_id 注入",

messages/zh-TW/settings/config.json

@@ -53,6 +53,8 @@
     "enableThinkingSignatureRectifierDesc": "當 Anthropic 類型供應商返回 thinking 簽名不相容或非法請求等錯誤時，自動移除不相容的 thinking 相關區塊並對同一供應商重試一次（預設開啟）。",
     "enableThinkingBudgetRectifier": "啟用 thinking 預算整流器",
     "enableThinkingBudgetRectifierDesc": "當 Anthropic 類型供應商返回 budget_tokens < 1024 錯誤時，自動將 thinking 預算設為最大值（32000），並在需要時將 max_tokens 設為 64000，然後重試一次（預設開啟）。",
+    "enableBillingHeaderRectifier": "啟用計費標頭整流器",
+    "enableBillingHeaderRectifierDesc": "主動移除 Claude Code 客戶端注入到 system 提示中的 x-anthropic-billing-header 文字區塊，防止 Amazon Bedrock 等非原生 Anthropic 上游回傳 400 錯誤（預設開啟）。",
     "enableCodexSessionIdCompletion": "啟用 Codex Session ID 補全",
     "enableCodexSessionIdCompletionDesc": "當 Codex 請求僅提供 session_id（請求頭）或 prompt_cache_key（請求體）之一時，自動補全另一個；若兩者皆缺失，則產生 UUID v7 會話 ID，並在同一對話內穩定複用。",
     "enableClaudeMetadataUserIdInjection": "啟用 Claude metadata.user_id 注入",

src/actions/system-config.ts

@@ -58,6 +58,7 @@ export async function saveSystemSettings(formData: {
   interceptAnthropicWarmupRequests?: boolean;
   enableThinkingSignatureRectifier?: boolean;
   enableThinkingBudgetRectifier?: boolean;
+  enableBillingHeaderRectifier?: boolean;
   enableCodexSessionIdCompletion?: boolean;
   enableClaudeMetadataUserIdInjection?: boolean;
   enableResponseFixer?: boolean;
@@ -93,6 +94,7 @@ export async function saveSystemSettings(formData: {
       interceptAnthropicWarmupRequests: validated.interceptAnthropicWarmupRequests,
       enableThinkingSignatureRectifier: validated.enableThinkingSignatureRectifier,
       enableThinkingBudgetRectifier: validated.enableThinkingBudgetRectifier,
+      enableBillingHeaderRectifier: validated.enableBillingHeaderRectifier,
       enableCodexSessionIdCompletion: validated.enableCodexSessionIdCompletion,
       enableClaudeMetadataUserIdInjection: validated.enableClaudeMetadataUserIdInjection,
       enableResponseFixer: validated.enableResponseFixer,

src/app/[locale]/settings/config/_components/system-settings-form.tsx

@@ -55,6 +55,7 @@ interface SystemSettingsFormProps {
     | "enableHttp2"
     | "interceptAnthropicWarmupRequests"
     | "enableThinkingSignatureRectifier"
+    | "enableBillingHeaderRectifier"
     | "enableThinkingBudgetRectifier"
     | "enableCodexSessionIdCompletion"
     | "enableClaudeMetadataUserIdInjection"
@@ -101,6 +102,9 @@ export function SystemSettingsForm({ initialSettings }: SystemSettingsFormProps)
   const [enableThinkingSignatureRectifier, setEnableThinkingSignatureRectifier] = useState(
     initialSettings.enableThinkingSignatureRectifier
   );
+  const [enableBillingHeaderRectifier, setEnableBillingHeaderRectifier] = useState(
+    initialSettings.enableBillingHeaderRectifier
+  );
   const [enableThinkingBudgetRectifier, setEnableThinkingBudgetRectifier] = useState(
     initialSettings.enableThinkingBudgetRectifier
   );
@@ -167,6 +171,7 @@ export function SystemSettingsForm({ initialSettings }: SystemSettingsFormProps)
         enableHttp2,
         interceptAnthropicWarmupRequests,
         enableThinkingSignatureRectifier,
+        enableBillingHeaderRectifier,
         enableThinkingBudgetRectifier,
         enableCodexSessionIdCompletion,
         enableClaudeMetadataUserIdInjection,
@@ -195,6 +200,7 @@ export function SystemSettingsForm({ initialSettings }: SystemSettingsFormProps)
         setEnableHttp2(result.data.enableHttp2);
         setInterceptAnthropicWarmupRequests(result.data.interceptAnthropicWarmupRequests);
         setEnableThinkingSignatureRectifier(result.data.enableThinkingSignatureRectifier);
+        setEnableBillingHeaderRectifier(result.data.enableBillingHeaderRectifier);
         setEnableThinkingBudgetRectifier(result.data.enableThinkingBudgetRectifier);
         setEnableCodexSessionIdCompletion(result.data.enableCodexSessionIdCompletion);
         setEnableClaudeMetadataUserIdInjection(result.data.enableClaudeMetadataUserIdInjection);
@@ -447,6 +453,29 @@ export function SystemSettingsForm({ initialSettings }: SystemSettingsFormProps)
           />
         </div>
 
+        {/* Enable Billing Header Rectifier */}
+        <div className="p-4 rounded-xl bg-white/[0.02] border border-white/5 flex items-center justify-between hover:bg-white/[0.04] transition-colors">
+          <div className="flex items-start gap-3">
+            <div className="w-8 h-8 flex items-center justify-center rounded-lg bg-amber-500/10 text-amber-400 shrink-0">
+              <FileCode className="h-4 w-4" />
+            </div>
+            <div>
+              <p className="text-sm font-medium text-foreground">
+                {t("enableBillingHeaderRectifier")}
+              </p>
+              <p className="text-xs text-muted-foreground mt-0.5">
+                {t("enableBillingHeaderRectifierDesc")}
+              </p>
+            </div>
+          </div>
+          <Switch
+            id="enable-billing-header-rectifier"
+            checked={enableBillingHeaderRectifier}
+            onCheckedChange={(checked) => setEnableBillingHeaderRectifier(checked)}
+            disabled={isPending}
+          />
+        </div>
+
         {/* Enable Codex Session ID Completion */}
         <div className="p-4 rounded-xl bg-white/[0.02] border border-white/5 flex items-center justify-between hover:bg-white/[0.04] transition-colors">
           <div className="flex items-start gap-3">

src/app/[locale]/settings/config/page.tsx

@@ -50,6 +50,7 @@ async function SettingsConfigContent() {
             interceptAnthropicWarmupRequests: settings.interceptAnthropicWarmupRequests,
             enableThinkingSignatureRectifier: settings.enableThinkingSignatureRectifier,
             enableThinkingBudgetRectifier: settings.enableThinkingBudgetRectifier,
+            enableBillingHeaderRectifier: settings.enableBillingHeaderRectifier,
             enableCodexSessionIdCompletion: settings.enableCodexSessionIdCompletion,
             enableClaudeMetadataUserIdInjection: settings.enableClaudeMetadataUserIdInjection,
             enableResponseFixer: settings.enableResponseFixer,

src/app/v1/_lib/proxy/billing-header-rectifier.ts

@@ -0,0 +1,78 @@
+/**
+ * Billing Header Rectifier - Proactive (pre-send) rectifier for Claude Code client
+ * billing header injection.
+ *
+ * Problem: Claude Code client v2.1.36+ injects `x-anthropic-billing-header: ...`
+ * as a text block inside the request body's `system` content array. Non-native
+ * Anthropic upstreams (e.g. Amazon Bedrock) reject this with 400:
+ * "x-anthropic-billing-header is a reserved keyword and may not be used in the system prompt."
+ *
+ * Solution: Strip these blocks before forwarding to upstream.
+ */
+
+export type BillingHeaderRectifierResult = {
+  applied: boolean;
+  removedCount: number;
+  extractedValues: string[];
+};
+
+const BILLING_HEADER_PATTERN = /^\s*x-anthropic-billing-header\s*:/i;
+
+/**
+ * Remove x-anthropic-billing-header text blocks from the request system prompt.
+ * Mutates the message object in place (matches existing rectifier conventions).
+ */
+export function rectifyBillingHeader(
+  message: Record<string, unknown>
+): BillingHeaderRectifierResult {
+  const system = message.system;
+
+  // Case 1: system is undefined/null/missing
+  if (system === undefined || system === null) {
+    return { applied: false, removedCount: 0, extractedValues: [] };
+  }
+
+  // Case 2: system is a plain string
+  if (typeof system === "string") {
+    if (BILLING_HEADER_PATTERN.test(system)) {
+      const extractedValues = [system.trim()];
+      delete message.system;
+      return { applied: true, removedCount: 1, extractedValues };
+    }
+    return { applied: false, removedCount: 0, extractedValues: [] };
+  }
+
+  // Case 3: system is an array of content blocks
+  if (Array.isArray(system)) {
+    const extractedValues: string[] = [];
+    const filtered: unknown[] = [];
+
+    for (const block of system) {
+      if (
+        block &&
+        typeof block === "object" &&
+        (block as Record<string, unknown>).type === "text" &&
+        typeof (block as Record<string, unknown>).text === "string" &&
+        BILLING_HEADER_PATTERN.test((block as Record<string, unknown>).text as string)
+      ) {
+        extractedValues.push(((block as Record<string, unknown>).text as string).trim());
+      } else {
+        filtered.push(block);
+      }
+    }
+
+    if (extractedValues.length > 0) {
+      // Mutate in place: replace system array contents
+      system.length = 0;
+      for (const item of filtered) {
+        system.push(item);
+      }
+      return { applied: true, removedCount: extractedValues.length, extractedValues };
+    }
+
+    return { applied: false, removedCount: 0, extractedValues: [] };
+  }
+
+  // Unknown type: no-op
+  return { applied: false, removedCount: 0, extractedValues: [] };
+}

src/app/v1/_lib/proxy/forwarder.ts

@@ -38,6 +38,7 @@ import { GeminiAuth } from "../gemini/auth";
 import { GEMINI_PROTOCOL } from "../gemini/protocol";
 import { HeaderProcessor } from "../headers";
 import { buildProxyUrl } from "../url";
+import { rectifyBillingHeader } from "./billing-header-rectifier";
 import {
   buildRequestDetails,
   categorizeErrorAsync,
@@ -51,7 +52,6 @@ import {
   ProxyError,
   sanitizeUrl,
 } from "./errors";
-
 import { ModelRedirector } from "./model-redirector";
 import { ProxyProviderResolver } from "./provider-selector";
 import type { ProxySession } from "./session";
@@ -1766,6 +1766,32 @@ export class ProxyForwarder {
       // Anthropic 供应商级参数覆写（默认 inherit=遵循客户端）
       // 说明：允许管理员在供应商层面强制覆写 max_tokens 和 thinking.budget_tokens
       if (provider.providerType === "claude" || provider.providerType === "claude-auth") {
+        // Billing header rectifier: proactively strip x-anthropic-billing-header from system prompt
+        {
+          const settings = await getCachedSystemSettings();
+          const billingRectifierEnabled = settings.enableBillingHeaderRectifier ?? true;
+          if (billingRectifierEnabled) {
+            const billingResult = rectifyBillingHeader(
+              session.request.message as Record<string, unknown>
+            );
+            if (billingResult.applied) {
+              session.addSpecialSetting({
+                type: "billing_header_rectifier",
+                scope: "request",
+                hit: true,
+                removedCount: billingResult.removedCount,
+                extractedValues: billingResult.extractedValues,
+              });
+              logger.info("ProxyForwarder: Billing header rectifier applied", {
+                providerId: provider.id,
+                providerName: provider.name,
+                removedCount: billingResult.removedCount,
+              });
+              await persistSpecialSettings(session);
+            }
+          }
+        }
+
         const { request: anthropicOverridden, audit: anthropicAudit } =
           applyAnthropicProviderOverridesWithAudit(
             provider,

src/drizzle/schema.ts

@@ -620,6 +620,12 @@ export const systemSettings = pgTable('system_settings', {
     .notNull()
     .default(true),
 
+  // billing header 整流器（默认开启）
+  // 开启后：主动移除 Claude Code 客户端注入到 system 提示中的 x-anthropic-billing-header 文本块
+  enableBillingHeaderRectifier: boolean('enable_billing_header_rectifier')
+    .notNull()
+    .default(true),
+
   // Codex Session ID 补全（默认开启）
   // 开启后：当 Codex 请求缺少 session_id / prompt_cache_key 时，自动补全或生成稳定的会话标识
   enableCodexSessionIdCompletion: boolean('enable_codex_session_id_completion')

src/lib/config/system-settings-cache.ts

@@ -30,6 +30,7 @@ const DEFAULT_SETTINGS: Pick<
   | "interceptAnthropicWarmupRequests"
   | "enableThinkingSignatureRectifier"
   | "enableThinkingBudgetRectifier"
+  | "enableBillingHeaderRectifier"
   | "enableCodexSessionIdCompletion"
   | "enableClaudeMetadataUserIdInjection"
   | "enableResponseFixer"
@@ -39,6 +40,7 @@ const DEFAULT_SETTINGS: Pick<
   interceptAnthropicWarmupRequests: false,
   enableThinkingSignatureRectifier: true,
   enableThinkingBudgetRectifier: true,
+  enableBillingHeaderRectifier: true,
   enableCodexSessionIdCompletion: true,
   enableClaudeMetadataUserIdInjection: true,
   enableResponseFixer: true,
@@ -111,6 +113,7 @@ export async function getCachedSystemSettings(): Promise<SystemSettings> {
       interceptAnthropicWarmupRequests: DEFAULT_SETTINGS.interceptAnthropicWarmupRequests,
       enableThinkingSignatureRectifier: DEFAULT_SETTINGS.enableThinkingSignatureRectifier,
       enableThinkingBudgetRectifier: DEFAULT_SETTINGS.enableThinkingBudgetRectifier,
+      enableBillingHeaderRectifier: DEFAULT_SETTINGS.enableBillingHeaderRectifier,
       enableCodexSessionIdCompletion: DEFAULT_SETTINGS.enableCodexSessionIdCompletion,
       enableClaudeMetadataUserIdInjection: DEFAULT_SETTINGS.enableClaudeMetadataUserIdInjection,
       enableResponseFixer: DEFAULT_SETTINGS.enableResponseFixer,

src/lib/utils/special-settings.ts

@@ -97,6 +97,8 @@ function buildSettingKey(setting: SpecialSetting): string {
         setting.after.maxTokens,
         setting.after.thinkingBudgetTokens,
       ]);
+    case "billing_header_rectifier":
+      return JSON.stringify([setting.type, setting.hit, setting.removedCount]);
     case "gemini_google_search_override":
       return JSON.stringify([
         setting.type,

src/lib/validation/schemas.ts

@@ -864,6 +864,8 @@ export const UpdateSystemSettingsSchema = z.object({
   enableThinkingSignatureRectifier: z.boolean().optional(),
   // thinking budget 整流器（可选）
   enableThinkingBudgetRectifier: z.boolean().optional(),
+  // billing header 整流器（可选）
+  enableBillingHeaderRectifier: z.boolean().optional(),
   // Codex Session ID 补全（可选）
   enableCodexSessionIdCompletion: z.boolean().optional(),
   // Claude metadata.user_id 注入（可选）

src/repository/_shared/transformers.ts

@@ -194,6 +194,7 @@ export function toSystemSettings(dbSettings: any): SystemSettings {
     interceptAnthropicWarmupRequests: dbSettings?.interceptAnthropicWarmupRequests ?? false,
     enableThinkingSignatureRectifier: dbSettings?.enableThinkingSignatureRectifier ?? true,
     enableThinkingBudgetRectifier: dbSettings?.enableThinkingBudgetRectifier ?? true,
+    enableBillingHeaderRectifier: dbSettings?.enableBillingHeaderRectifier ?? true,
     enableCodexSessionIdCompletion: dbSettings?.enableCodexSessionIdCompletion ?? true,
     enableClaudeMetadataUserIdInjection: dbSettings?.enableClaudeMetadataUserIdInjection ?? true,
     enableResponseFixer: dbSettings?.enableResponseFixer ?? true,

src/repository/system-config.ts

@@ -151,6 +151,7 @@ function createFallbackSettings(): SystemSettings {
     interceptAnthropicWarmupRequests: false,
     enableThinkingSignatureRectifier: true,
     enableThinkingBudgetRectifier: true,
+    enableBillingHeaderRectifier: true,
     enableCodexSessionIdCompletion: true,
     enableClaudeMetadataUserIdInjection: true,
     enableResponseFixer: true,
@@ -194,6 +195,7 @@ export async function getSystemSettings(): Promise<SystemSettings> {
       interceptAnthropicWarmupRequests: systemSettings.interceptAnthropicWarmupRequests,
       enableThinkingSignatureRectifier: systemSettings.enableThinkingSignatureRectifier,
       enableThinkingBudgetRectifier: systemSettings.enableThinkingBudgetRectifier,
+      enableBillingHeaderRectifier: systemSettings.enableBillingHeaderRectifier,
       enableCodexSessionIdCompletion: systemSettings.enableCodexSessionIdCompletion,
       enableClaudeMetadataUserIdInjection: systemSettings.enableClaudeMetadataUserIdInjection,
       enableResponseFixer: systemSettings.enableResponseFixer,
@@ -349,6 +351,11 @@ export async function updateSystemSettings(
       updates.enableThinkingBudgetRectifier = payload.enableThinkingBudgetRectifier;
     }
 
+    // billing header 整流器开关（如果提供）
+    if (payload.enableBillingHeaderRectifier !== undefined) {
+      updates.enableBillingHeaderRectifier = payload.enableBillingHeaderRectifier;
+    }
+
     // Codex Session ID 补全开关（如果提供）
     if (payload.enableCodexSessionIdCompletion !== undefined) {
       updates.enableCodexSessionIdCompletion = payload.enableCodexSessionIdCompletion;

src/types/special-settings.ts

@@ -11,6 +11,7 @@ export type SpecialSetting =
   | GuardInterceptSpecialSetting
   | ThinkingSignatureRectifierSpecialSetting
   | ThinkingBudgetRectifierSpecialSetting
+  | BillingHeaderRectifierSpecialSetting
   | CodexSessionIdCompletionSpecialSetting
   | ClaudeMetadataUserIdInjectionSpecialSetting
   | AnthropicCacheTtlHeaderOverrideSpecialSetting
@@ -152,6 +153,14 @@ export type ClaudeMetadataUserIdInjectionSpecialSetting = {
   sessionId: string | null;
 };
 
+export type BillingHeaderRectifierSpecialSetting = {
+  type: "billing_header_rectifier";
+  scope: "request";
+  hit: boolean;
+  removedCount: number;
+  extractedValues: string[];
+};
+
 export type ThinkingBudgetRectifierSpecialSetting = {
   type: "thinking_budget_rectifier";
   scope: "request";

src/types/system-config.ts

@@ -53,6 +53,11 @@ export interface SystemSettings {
   // 目标：当 Anthropic 类型供应商出现 budget_tokens < 1024 错误时，自动整流并重试一次
   enableThinkingBudgetRectifier: boolean;
 
+  // billing header 整流器（默认开启）
+  // 目标：主动移除 Claude Code 客户端注入到 system 提示中的 x-anthropic-billing-header 文本块，
+  // 防止 Amazon Bedrock 等非原生 Anthropic 上游返回 400 错误
+  enableBillingHeaderRectifier: boolean;
+
   // Codex Session ID 补全（默认开启）
   // 目标：当 Codex 请求缺少 session_id / prompt_cache_key 时，自动补全或生成稳定的会话标识
   enableCodexSessionIdCompletion: boolean;
@@ -115,6 +120,9 @@ export interface UpdateSystemSettingsInput {
   // thinking budget 整流器（可选）
   enableThinkingBudgetRectifier?: boolean;
 
+  // billing header 整流器（可选）
+  enableBillingHeaderRectifier?: boolean;
+
   // Codex Session ID 补全（可选）
   enableCodexSessionIdCompletion?: boolean;
 

tests/unit/actions/system-config-save.test.ts

@@ -65,7 +65,10 @@ describe("saveSystemSettings", () => {
       enableHttp2: false,
       interceptAnthropicWarmupRequests: false,
       enableThinkingSignatureRectifier: false,
+      enableThinkingBudgetRectifier: false,
+      enableBillingHeaderRectifier: true,
       enableCodexSessionIdCompletion: false,
+      enableClaudeMetadataUserIdInjection: false,
       enableResponseFixer: false,
       responseFixerConfig: {
         fixEncoding: false,
@@ -186,7 +189,10 @@ describe("saveSystemSettings", () => {
       enableHttp2: true,
       interceptAnthropicWarmupRequests: false,
       enableThinkingSignatureRectifier: false,
+      enableThinkingBudgetRectifier: false,
+      enableBillingHeaderRectifier: true,
       enableCodexSessionIdCompletion: false,
+      enableClaudeMetadataUserIdInjection: false,
       enableResponseFixer: false,
       responseFixerConfig: {
         fixEncoding: false,

tests/unit/lib/config/system-settings-cache.test.ts

@@ -40,7 +40,10 @@ function createSettings(overrides: Partial<SystemSettings> = {}): SystemSettings
     enableHttp2: false,
     interceptAnthropicWarmupRequests: false,
     enableThinkingSignatureRectifier: true,
+    enableThinkingBudgetRectifier: true,
+    enableBillingHeaderRectifier: true,
     enableCodexSessionIdCompletion: true,
+    enableClaudeMetadataUserIdInjection: true,
     enableResponseFixer: true,
     responseFixerConfig: {
       fixTruncatedJson: true,

tests/unit/proxy/billing-header-rectifier.test.ts

@@ -0,0 +1,213 @@
+import { describe, expect, test } from "vitest";
+import { rectifyBillingHeader } from "@/app/v1/_lib/proxy/billing-header-rectifier";
+
+describe("rectifyBillingHeader", () => {
+  test("system array with single billing header block - removes it and returns extractedValues", () => {
+    const message: Record<string, unknown> = {
+      system: [
+        {
+          type: "text",
+          text: "x-anthropic-billing-header: cc_version=2.1.36; cc_entrypoint=cli; cch=1;",
+        },
+      ],
+    };
+
+    const result = rectifyBillingHeader(message);
+
+    expect(result.applied).toBe(true);
+    expect(result.removedCount).toBe(1);
+    expect(result.extractedValues).toEqual([
+      "x-anthropic-billing-header: cc_version=2.1.36; cc_entrypoint=cli; cch=1;",
+    ]);
+    expect(message.system).toEqual([]);
+  });
+
+  test("system array with multiple billing header blocks - removes all", () => {
+    const message: Record<string, unknown> = {
+      system: [
+        { type: "text", text: "x-anthropic-billing-header: cc_version=2.1.36;" },
+        { type: "text", text: "x-anthropic-billing-header: cc_entrypoint=cli;" },
+      ],
+    };
+
+    const result = rectifyBillingHeader(message);
+
+    expect(result.applied).toBe(true);
+    expect(result.removedCount).toBe(2);
+    expect(result.extractedValues).toHaveLength(2);
+    expect(message.system).toEqual([]);
+  });
+
+  test("system array with no billing header - applied=false, array unchanged", () => {
+    const blocks = [
+      { type: "text", text: "You are a helpful assistant." },
+      { type: "text", text: "Follow instructions carefully." },
+    ];
+    const message: Record<string, unknown> = {
+      system: [...blocks],
+    };
+
+    const result = rectifyBillingHeader(message);
+
+    expect(result.applied).toBe(false);
+    expect(result.removedCount).toBe(0);
+    expect(result.extractedValues).toEqual([]);
+    expect(message.system).toEqual(blocks);
+  });
+
+  test("system array with billing header mixed with real prompts - only removes billing header blocks", () => {
+    const message: Record<string, unknown> = {
+      system: [
+        { type: "text", text: "You are a helpful assistant." },
+        { type: "text", text: "x-anthropic-billing-header: cc_version=2.1.36; cch=1;" },
+        { type: "text", text: "Follow instructions carefully." },
+      ],
+    };
+
+    const result = rectifyBillingHeader(message);
+
+    expect(result.applied).toBe(true);
+    expect(result.removedCount).toBe(1);
+    expect(message.system).toEqual([
+      { type: "text", text: "You are a helpful assistant." },
+      { type: "text", text: "Follow instructions carefully." },
+    ]);
+  });
+
+  test("system as plain string that IS a billing header - deletes system field", () => {
+    const message: Record<string, unknown> = {
+      system: "x-anthropic-billing-header: cc_version=2.1.36;",
+    };
+
+    const result = rectifyBillingHeader(message);
+
+    expect(result.applied).toBe(true);
+    expect(result.removedCount).toBe(1);
+    expect(result.extractedValues).toEqual(["x-anthropic-billing-header: cc_version=2.1.36;"]);
+    expect(message.system).toBeUndefined();
+  });
+
+  test("system as plain string that is NOT a billing header - applied=false", () => {
+    const message: Record<string, unknown> = {
+      system: "You are a helpful assistant.",
+    };
+
+    const result = rectifyBillingHeader(message);
+
+    expect(result.applied).toBe(false);
+    expect(result.removedCount).toBe(0);
+    expect(message.system).toBe("You are a helpful assistant.");
+  });
+
+  test("system undefined/missing - applied=false", () => {
+    const message: Record<string, unknown> = { model: "claude-3" };
+
+    const result = rectifyBillingHeader(message);
+
+    expect(result.applied).toBe(false);
+    expect(result.removedCount).toBe(0);
+    expect(result.extractedValues).toEqual([]);
+  });
+
+  test("system null - applied=false", () => {
+    const message: Record<string, unknown> = { system: null };
+
+    const result = rectifyBillingHeader(message);
+
+    expect(result.applied).toBe(false);
+    expect(result.removedCount).toBe(0);
+  });
+
+  test("billing header mid-string (not at start) - should NOT remove", () => {
+    const message: Record<string, unknown> = {
+      system: [
+        {
+          type: "text",
+          text: "Some preamble text x-anthropic-billing-header: cc_version=2.1.36;",
+        },
+      ],
+    };
+
+    const result = rectifyBillingHeader(message);
+
+    expect(result.applied).toBe(false);
+    expect(result.removedCount).toBe(0);
+    expect((message.system as unknown[]).length).toBe(1);
+  });
+
+  test("case insensitivity (X-Anthropic-Billing-Header:)", () => {
+    const message: Record<string, unknown> = {
+      system: [{ type: "text", text: "X-Anthropic-Billing-Header: cc_version=2.1.36;" }],
+    };
+
+    const result = rectifyBillingHeader(message);
+
+    expect(result.applied).toBe(true);
+    expect(result.removedCount).toBe(1);
+    expect(message.system).toEqual([]);
+  });
+
+  test("system array becoming empty after removal - remains empty array", () => {
+    const message: Record<string, unknown> = {
+      system: [
+        { type: "text", text: "x-anthropic-billing-header: val1" },
+        { type: "text", text: "x-anthropic-billing-header: val2" },
+      ],
+    };
+
+    const result = rectifyBillingHeader(message);
+
+    expect(result.applied).toBe(true);
+    expect(result.removedCount).toBe(2);
+    expect(message.system).toEqual([]);
+  });
+
+  test("various billing header value formats", () => {
+    const message: Record<string, unknown> = {
+      system: [
+        { type: "text", text: "x-anthropic-billing-header:cc_version=2.1.36" },
+        {
+          type: "text",
+          text: "  x-anthropic-billing-header: cc_version=2.2.0; cc_entrypoint=vscode;",
+        },
+        { type: "text", text: "x-anthropic-billing-header:  " },
+      ],
+    };
+
+    const result = rectifyBillingHeader(message);
+
+    expect(result.applied).toBe(true);
+    expect(result.removedCount).toBe(3);
+    expect(result.extractedValues).toHaveLength(3);
+    expect(message.system).toEqual([]);
+  });
+
+  test("non-text type blocks are preserved", () => {
+    const message: Record<string, unknown> = {
+      system: [
+        { type: "image", source: { type: "base64" } },
+        { type: "text", text: "x-anthropic-billing-header: val" },
+        { type: "text", text: "Keep this" },
+      ],
+    };
+
+    const result = rectifyBillingHeader(message);
+
+    expect(result.applied).toBe(true);
+    expect(result.removedCount).toBe(1);
+    expect(message.system).toEqual([
+      { type: "image", source: { type: "base64" } },
+      { type: "text", text: "Keep this" },
+    ]);
+  });
+
+  test("system as non-string non-array type (e.g. number) - no-op", () => {
+    const message: Record<string, unknown> = { system: 42 };
+
+    const result = rectifyBillingHeader(message);
+
+    expect(result.applied).toBe(false);
+    expect(result.removedCount).toBe(0);
+    expect(message.system).toBe(42);
+  });
+});