refactor(llm-configs):

remove unused reserved_jsonb fields

   Remove the three reserved JSONB fields (reserved_jsonb_1, reserved_jsonb_2, reserved_jsonb_3) from the llm_model_configs
   table. These fields were planned for future use but are no longer needed.

docs/gns3-copilot/implemented/llm-model-configs.md

@@ -45,9 +45,6 @@ User's own config > User's group config
 | `group_id` | UUID (nullable) | Foreign key to user_groups table |
 | `is_default` | BOOLEAN | Default configuration flag |
 | `version` | INTEGER | Optimistic locking version (starts at 0, increments on each update) |
-| `reserved_jsonb_1` | JSONB (nullable) | Reserved field for future use |
-| `reserved_jsonb_2` | JSONB (nullable) | Reserved field for future use |
-| `reserved_jsonb_3` | JSONB (nullable) | Reserved field for future use |
 | `created_at` | TIMESTAMP | Creation timestamp |
 | `updated_at` | TIMESTAMP | Last update timestamp |
 
@@ -808,29 +805,6 @@ This enables fast lookups when filtering by model type, even with large datasets
 
 ---
 
-## Reserved Fields
-
-The `llm_model_configs` table includes three reserved JSONB fields for future extensibility:
-
-| Field | Type | Description |
-|-------|------|-------------|
-| `reserved_jsonb_1` | JSONB (nullable) | Reserved for future use |
-| `reserved_jsonb_2` | JSONB (nullable) | Reserved for future use |
-| `reserved_jsonb_3` | JSONB (nullable) | Reserved for future use |
-
-**Purpose:** These fields are reserved for future feature development without requiring schema changes. They are currently unused in the API code but are available in the database layer for future enhancements.
-
-**Use Cases:** Future features might use these fields for:
-- Advanced configuration options
-- Metadata storage
-- Feature flags
-- Extension data
-- Caching computed values
-
-**Note:** These fields are not exposed in the current API schemas and are reserved for internal use.
-
----
-
 ## Context Limit Configuration
 
 ### What is `context_limit`?

gns3server/db/models/llm_model_configs.py

@@ -42,11 +42,6 @@ class LLMModelConfig(BaseTable):
     is_default = Column(Boolean, default=False, nullable=False)
     version = Column(Integer, default=0, nullable=False)  # Optimistic locking version
 
-    # Reserved fields for future use (currently unused in code)
-    reserved_jsonb_1 = Column(JSON, nullable=True)
-    reserved_jsonb_2 = Column(JSON, nullable=True)
-    reserved_jsonb_3 = Column(JSON, nullable=True)
-
     # Relationships
     user = relationship("User", backref="llm_model_configs")
     group = relationship("UserGroup", backref="llm_model_configs")

gns3server/db_migrations/versions/20260303_create_llm_model_configs_table.py

@@ -42,9 +42,6 @@ def upgrade() -> None:
         sa.Column('version', sa.Integer(), nullable=False, server_default='0'),
         sa.Column('created_at', sa.DateTime(), nullable=True),
         sa.Column('updated_at', sa.DateTime(), nullable=True),
-        sa.Column('reserved_jsonb_1', sa.JSON(), nullable=True, comment='Reserved field for future use'),
-        sa.Column('reserved_jsonb_2', sa.JSON(), nullable=True, comment='Reserved field for future use'),
-        sa.Column('reserved_jsonb_3', sa.JSON(), nullable=True, comment='Reserved field for future use'),
         sa.CheckConstraint(
             "(user_id IS NOT NULL AND group_id IS NULL) OR "
             "(user_id IS NULL AND group_id IS NOT NULL)",