Updated the author name and copyright statements across the gns3_copilot module. The name has been standardized from "Guobin Yue" to "Yue Guobin (岳国宾)" to reflect the correct author attribution including Chinese characters.
32 KiB
User-Selectable Group Default Config
Document Status: Design Phase Priority: Medium Created: 2026-03-06 Related Docs: LLM Model Configs API
Table of Contents
- Problem Description
- Current State Analysis
- Requirements Analysis
- Solution Design
- Implementation Steps
- Code Changes Checklist
- Testing Plan
- Risk Assessment
Problem Description
Current Behavior
Regular users cannot select an inherited group LLM model config as their default config, even though they can see the inherited group configs in their config list.
User Scenario
- Administrator creates multiple LLM model configs for a user group (e.g., GPT-4, Claude 3.5, Gemini Pro)
- The group default is set to GPT-4
- Users inherit these configs and can see all group configs in their config list
- Users want to use Claude 3.5 as their default, but have no way to set it via API
Existing Code Limitation
File: gns3server/db/repositories/llm_model_configs.py:194-218
async def set_user_default_config(self, user_id: UUID, config_id: UUID) -> bool:
"""Set a user's default LLM model configuration."""
# ...
# Set new default
query = update(models.LLMModelConfig).where(
and_(
models.LLMModelConfig.config_id == config_id,
models.LLMModelConfig.user_id == user_id # KEY LIMITATION
)
).values(is_default=True, updated_at=now)
Problem: The user_id == user_id condition restricts setting only user's own configs. Inherited group configs have user_id as NULL, so they cannot be set as default.
Current State Analysis
Current Config Retrieval Flow
User requests config list
↓
GET /v3/access/users/{user_id}/llm-model-configs
↓
get_user_effective_configs(user_id)
↓
Returns: {
configs: [
{ source: "user", ... }, # User's own configs
{ source: "group", ... } # Inherited group configs
],
default_config: { ... } # Current default config
}
Default Config Selection Priority
Current Logic (llm_model_configs.py:503-520):
- User config marked with
is_default: true - Group config marked with
is_default: true - First config in the list (user configs come before group configs)
Agent Config Retrieval Flow
Key Discovery: Agent retrieves config via user_id, doesn't care about config source.
Flow:
Agent → get_user_llm_config_full(user_id, app)
↓
get_user_effective_configs(user_id)
↓
Returns default config (auto-decrypts API key)
↓
Agent uses config to call LLM
Key Files:
gns3server/db/tasks.py:314-406-get_user_llm_config_fullgns3server/api/routes/controller/chat.py:122- API entry point
API Key Visibility Control
| Scenario | User Configs | Group Configs |
|---|---|---|
| User viewing own configs | Visible | Hidden (null) |
| Admin viewing other users' configs | Hidden | Hidden |
| Agent usage (system-level) | Visible | Visible (direct DB access) |
Requirements Analysis
Functional Requirements
-
Users can select group config as default
- Users can set any accessible config (own or inherited) as default via API
- API endpoint remains unchanged:
PUT /v3/access/users/{user_id}/llm-model-configs/default/{config_id}
-
Maintain API Key Security
- Group config API keys remain hidden when users view config list
- Agent can access and decrypt group config API keys when using
-
Backward Compatibility
- No impact on existing user configs
- No impact on Agent calling flow
- Config list response structure remains consistent
Non-Functional Requirements
- Performance: No significant query overhead
- Maintainability: Clear code logic, easy to understand and maintain
- Extensibility: Future support for config overrides (users modifying certain parameters of inherited configs)
Solution Design
Selection: Shadow Config Approach
Add inherited_from_config_id field to llm_model_configs table. When user selects a group config as default, create a "shadow config" record.
Data Model Design
Table Structure Modification
File: gns3server/db/models/llm_model_configs.py
class LLMModelConfig(BaseTable):
"""LLM model configuration for users and user groups."""
__tablename__ = "llm_model_configs"
config_id = Column(GUID, primary_key=True, default=generate_uuid)
name = Column(String(100), nullable=False)
model_type = Column(String(50), nullable=False)
config = Column(JSON, nullable=False)
user_id = Column(GUID, ForeignKey("users.user_id", ondelete="CASCADE"), nullable=True)
group_id = Column(GUID, ForeignKey("user_groups.user_group_id", ondelete="CASCADE"), nullable=True)
is_default = Column(Boolean, default=False, nullable=False)
version = Column(Integer, default=0, nullable=False)
# NEW FIELD: Shadow config references original group config
inherited_from_config_id = Column(
GUID,
ForeignKey("llm_model_configs.config_id", ondelete="CASCADE"),
nullable=True
)
# Relationships
inherited_from = relationship(
"LLMModelConfig",
remote_side=[config_id],
backref="shadow_configs"
)
# Constraints
__table_args__ = (
# Original constraints...
CheckConstraint(
"(user_id IS NOT NULL AND group_id IS NULL) OR "
"(user_id IS NULL AND group_id IS NOT NULL)",
name="single_owner_check"
),
# NEW CONSTRAINT: Shadow configs must belong to users
CheckConstraint(
"inherited_from_config_id IS NULL OR user_id IS NOT NULL",
name="shadow_config_belong_to_user"
),
# ... other constraints
)
Shadow Config Explanation
| Field | Value | Description |
|---|---|---|
config_id |
New UUID | Shadow config's unique identifier |
name |
Original group config's name | Display name |
model_type |
Original group config's type | Config type |
config |
{"api_key": "__INHERITED_FROM_GROUP__", ...} |
Config data, API key marked with special value |
user_id |
Current user's ID | Belongs to user |
group_id |
NULL |
Shadow config doesn't belong to group |
is_default |
true |
Marked as default config |
inherited_from_config_id |
Original group config's ID | References original config |
Workflow
1. User Sets Group Config as Default
User Request: PUT /users/{user_id}/llm-model-configs/default/{group_config_id}
↓
set_user_default_config(user_id, group_config_id)
↓
Detects group_config_id is a group config
↓
Creates shadow config:
- user_id = current user
- inherited_from_config_id = group_config_id
- config = original config (API key marked as "__INHERITED_FROM_GROUP__")
- is_default = true
↓
Deletes old shadow configs and default flags
↓
Commits to database
2. User Views Config List
GET /users/{user_id}/llm-model-configs
↓
get_user_effective_configs(user_id)
↓
Gets user configs (including shadow configs)
↓
For shadow configs:
- Reads complete data from original group config
- Hides API key (sets to null)
- Marks source = "user"
- Marks inherited_from = original config ID
↓
Returns config list
3. Agent Retrieves Config for Usage
Agent → get_user_llm_config_full(user_id, app)
↓
Gets default config (detects it's a shadow config)
↓
Gets encrypted API key from original group config
↓
Decrypts API key
↓
Returns complete config (including API key)
↓
Agent uses config to call LLM
Solution Advantages
| Advantage | Description |
|---|---|
| Data Integrity | Foreign key constraints ensure referential integrity, cascading deletes handle cleanup |
| Backward Compatible | No modification to existing logic, shadow config is a new feature |
| Clear Semantics | inherited_from_config_id clearly indicates inheritance relationship |
| Unified API | Users don't need to care about config source, just select directly |
| Extensible | Shadow config can add override fields in the future (e.g., user-custom parameters) |
| No Agent Changes Required | Agent still retrieves config via user_id, automatically compatible |
Implementation Steps
Step 1: Database Migration
Create new migration file: gns3server/db_migrations/versions/{timestamp}_add_inherited_from_config_id.py
"""Add inherited_from_config_id to llm_model_configs table
Revision ID: xxx_add_inherited_from_config_id
Revises: [previous_revision_id]
Create Date: 2026-03-06
This migration adds support for shadow configs, allowing users to select
inherited group configurations as their default.
"""
from alembic import op
import sqlalchemy as sa
def upgrade():
# Add the new column
op.add_column(
'llm_model_configs',
sa.Column(
'inherited_from_config_id',
sa.GUID(),
nullable=True
)
)
# Create foreign key constraint
op.create_foreign_key(
'fk_llm_configs_inherited_from',
'llm_model_configs', 'llm_model_configs',
['inherited_from_config_id'], ['config_id'],
ondelete='CASCADE'
)
# Add check constraint: shadow configs must belong to users
op.execute("""
ALTER TABLE llm_model_configs
ADD CONSTRAINT shadow_config_belong_to_user
CHECK (inherited_from_config_id IS NULL OR user_id IS NOT NULL)
""")
def downgrade():
# Remove constraints and column
op.execute("ALTER TABLE llm_model_configs DROP CONSTRAINT shadow_config_belong_to_user")
op.drop_constraint('fk_llm_configs_inherited_from', 'llm_model_configs', type_='foreignkey')
op.drop_column('llm_model_configs', 'inherited_from_config_id')
Step 2: Modify Data Model
File: gns3server/db/models/llm_model_configs.py
Add to LLMModelConfig class:
inherited_from_config_idfieldinherited_fromrelationshipshadow_config_belong_to_userconstraint
Step 3: Modify Repository Layer
File: gns3server/db/repositories/llm_model_configs.py
3.1 Modify set_user_default_config Method
async def set_user_default_config(self, user_id: UUID, config_id: UUID) -> bool:
"""
Set a user's default LLM model configuration.
Supports setting inherited group configs as default via shadow configs.
Args:
user_id: User UUID
config_id: Configuration UUID (can be user's own or inherited group config)
Returns:
True if successful, False if config not found or not accessible
"""
from gns3server.utils.encryption import is_encrypted
# Check if config is accessible to user
effective = await self.get_user_effective_configs(
user_id,
current_user_id=user_id
)
accessible_config_ids = {c["config_id"] for c in effective["configs"]}
if config_id not in accessible_config_ids:
return False
# Get the original config
result = await self._db_session.execute(
select(models.LLMModelConfig).where(
models.LLMModelConfig.config_id == config_id
)
)
orig_config = result.scalars().first()
if not orig_config:
return False
now = datetime.utcnow()
if orig_config.user_id == user_id:
# Scenario 1: User selects their own config
# Use the existing is_default mechanism
# Delete old shadow configs
await self._db_session.execute(
delete(models.LLMModelConfig)
.where(
and_(
models.LLMModelConfig.user_id == user_id,
models.LLMModelConfig.inherited_from_config_id.isnot(None)
)
)
)
# Clear all user default flags
await self._db_session.execute(
update(models.LLMModelConfig)
.where(
and_(
models.LLMModelConfig.user_id == user_id,
models.LLMModelConfig.is_default == True
)
)
.values(is_default=False, updated_at=now)
)
# Set new default
await self._db_session.execute(
update(models.LLMModelConfig)
.where(
and_(
models.LLMModelConfig.config_id == config_id,
models.LLMModelConfig.user_id == user_id
)
)
.values(is_default=True, updated_at=now)
)
else:
# Scenario 2: User selects a group config - create shadow config
# Clear all user default flags
await self._db_session.execute(
update(models.LLMModelConfig)
.where(models.LLMModelConfig.user_id == user_id)
.values(is_default=False)
)
# Delete old shadow configs
await self._db_session.execute(
delete(models.LLMModelConfig)
.where(
and_(
models.LLMModelConfig.user_id == user_id,
models.LLMModelConfig.inherited_from_config_id.isnot(None)
)
)
)
# Copy config data, but mark API key as inherited
shadow_config_data = orig_config.config.copy()
shadow_config_data["api_key"] = "__INHERITED_FROM_GROUP__"
# Create shadow config
shadow_config = models.LLMModelConfig(
name=orig_config.name,
model_type=orig_config.model_type,
config=shadow_config_data,
user_id=user_id,
group_id=None,
is_default=True,
inherited_from_config_id=config_id,
version=0,
created_at=now,
updated_at=now
)
self._db_session.add(shadow_config)
await self._db_session.commit()
return True
3.2 Modify get_user_effective_configs Method
Add special logic for shadow config handling:
# In get_user_effective_configs method
# Process user configs (including shadow configs)
user_configs = await self.get_user_configs(user_id)
# Build map of group configs for shadow config resolution
group_configs_map = {}
group_names_map = {}
for group in user_groups:
configs = await self.get_group_configs(group.user_group_id)
if configs:
group_configs_map[group.user_group_id] = configs
group_names_map[group.user_group_id] = group.name
# Flatten group configs for easy access
all_group_configs = {}
for configs in group_configs_map.values():
for config in configs:
all_group_configs[config.config_id] = config
configs_with_source = []
# Process each user config
for config in user_configs:
if config.inherited_from_config_id:
# This is a shadow config - resolve from parent group config
parent_config = all_group_configs.get(config.inherited_from_config_id)
if parent_config:
config_dict = parent_config.config.copy()
# Hide API key in shadow configs (users viewing their own configs)
if "api_key" in config_dict:
config_dict["api_key"] = None
configs_with_source.append({
"config_id": config.config_id,
"name": config.name,
"model_type": config.model_type,
"config": config_dict,
"user_id": config.user_id,
"group_id": None,
"is_default": config.is_default,
"version": config.version,
"created_at": config.created_at,
"updated_at": config.updated_at,
"source": "user",
"inherited_from": config.inherited_from_config_id,
"group_name": group_names_map.get(parent_config.group_id)
})
else:
# Regular user config - existing logic
config_dict = config.config.copy()
# API key visibility control
if "api_key" in config_dict and config_dict["api_key"]:
if is_viewing_own:
try:
if is_encrypted(config_dict["api_key"]):
config_dict["api_key"] = decrypt(config_dict["api_key"])
except Exception as e:
log.warning(f"Failed to decrypt API key: {e}")
config_dict["api_key"] = None
else:
config_dict["api_key"] = None
configs_with_source.append({
"config_id": config.config_id,
"name": config.name,
"model_type": config.model_type,
"config": config_dict,
"user_id": config.user_id,
"group_id": config.group_id,
"is_default": config.is_default,
"version": config.version,
"created_at": config.created_at,
"updated_at": config.updated_at,
"source": "user",
"inherited_from": None,
"group_name": None
})
# Add inherited group configs (exclude those already shadowed)
shadow_inherited_ids = {
c["inherited_from"]
for c in configs_with_source
if c["inherited_from"]
}
for group_id, configs in group_configs_map.items():
for config in configs:
if config.config_id in shadow_inherited_ids:
continue # Already shadowed, don't duplicate
config_dict = config.config.copy()
if "api_key" in config_dict:
config_dict["api_key"] = None
configs_with_source.append({
"config_id": config.config_id,
"name": config.name,
"model_type": config.model_type,
"config": config_dict,
"user_id": None,
"group_id": config.group_id,
"is_default": config.is_default,
"version": config.version,
"created_at": config.created_at,
"updated_at": config.updated_at,
"source": "group",
"inherited_from": None,
"group_name": group_names_map[group_id]
})
# Select default_config (shadow configs have priority since marked is_default=true)
default_config = None
for config in configs_with_source:
if config["is_default"] and config["source"] == "user":
default_config = config
break
if default_config is None:
for config in configs_with_source:
if config["is_default"] and config["source"] == "group":
default_config = config
break
if default_config is None and configs_with_source:
default_config = configs_with_source[0]
return {
"configs": configs_with_source,
"default_config": default_config
}
Step 4: Modify System-Level Config Retrieval
File: gns3server/db/tasks.py
Modify get_user_llm_config_full function to add shadow config API key decryption logic:
async def get_user_llm_config_full(user_id: str, app: FastAPI) -> Optional[dict]:
"""
Get user's full LLM configuration with decrypted API key for Copilot.
This is a system-level function that bypasses API security restrictions.
It retrieves the complete configuration including decrypted API keys,
even for inherited group configurations and shadow configs.
Args:
user_id: User UUID
app: FastAPI application instance
Returns:
Dictionary with LLM configuration (provider, model, api_key, etc.)
or None if not found.
"""
from uuid import UUID
from gns3server.db.repositories.llm_model_configs import LLMModelConfigsRepository
from gns3server.utils.encryption import decrypt, is_encrypted
try:
user_uuid = UUID(user_id) if isinstance(user_id, str) else user_id
async with AsyncSession(app.state._db_engine, expire_on_commit=False) as session:
repo = LLMModelConfigsRepository(session)
# Get effective configs (own + inherited from groups)
result = await repo.get_user_effective_configs(
user_uuid,
current_user_id=user_uuid,
current_user_is_superadmin=False
)
if not result or not result.get("default_config"):
log.warning(f"No default LLM configuration found for user {user_id}")
return None
default_config = result["default_config"]
config_id = default_config["config_id"]
source = default_config["source"]
inherited_from = default_config.get("inherited_from")
# Get full config from database
full_config = await repo.get_user_config(config_id)
if not full_config:
log.error(f"Failed to retrieve full config: config_id={config_id}")
return None
# Decrypt API key
config_data = full_config.config.copy()
inherited_from_config_id = full_config.inherited_from_config_id
# If shadow config, get API key from parent group config
if inherited_from_config_id:
parent_config = await repo.get_group_config(inherited_from_config_id)
if parent_config and "api_key" in parent_config.config:
try:
encrypted_key = parent_config.config["api_key"]
if encrypted_key and is_encrypted(encrypted_key):
config_data["api_key"] = decrypt(encrypted_key)
log.debug(f"Decrypted API key from inherited group config for user {user_id}")
else:
config_data["api_key"] = encrypted_key
except Exception as e:
log.error(f"Failed to decrypt inherited API key: {e}")
config_data["api_key"] = None
else:
log.error(f"Parent group config not found for shadow config: {inherited_from_config_id}")
config_data["api_key"] = None
else:
# Regular user config - decrypt API key directly
if "api_key" in config_data and config_data["api_key"]:
try:
if is_encrypted(config_data["api_key"]):
config_data["api_key"] = decrypt(config_data["api_key"])
log.debug(f"Successfully decrypted API key for user {user_id}")
except Exception as e:
log.error(f"Failed to decrypt API key: {e}")
config_data["api_key"] = None
# Build configuration dict
llm_config = {
"config_id": str(full_config.config_id),
"name": full_config.name,
"model_type": str(full_config.model_type),
"source": source,
"inherited_from": str(inherited_from_config_id) if inherited_from_config_id else None,
"group_name": default_config.get("group_name"),
"user_id": str(full_config.user_id) if full_config.user_id else None,
"group_id": str(full_config.group_id) if full_config.group_id else None,
**config_data
}
# Validate required fields
if not llm_config.get("provider"):
log.error(f"LLM config missing 'provider' field: {config_id}")
return None
if not llm_config.get("model"):
log.error(f"LLM config missing 'model' field: {config_id}")
return None
log.info(
f"Retrieved LLM config for user {user_id}: "
f"provider={llm_config.get('provider')}, model={llm_config.get('model')}, "
f"source={source}, inherited_from={inherited_from_config_id}"
)
return llm_config
except Exception as e:
log.error(f"Failed to retrieve LLM config for user {user_id}: {e}", exc_info=True)
return None
Step 5: Update Schema (Optional)
If you want to display inherited_from field in API response, update relevant Schema:
File: gns3server/schemas/controller/chat.py or corresponding schema file
class LLMModelConfigWithSource(BaseModel):
"""LLM model configuration with source information."""
config_id: UUID
name: str
model_type: str
config: Dict[str, Any]
user_id: Optional[UUID] = None
group_id: Optional[UUID] = None
is_default: bool
version: int
created_at: datetime
updated_at: datetime
source: str # "user" or "group"
group_name: Optional[str] = None
inherited_from: Optional[UUID] = None # NEW FIELD
Step 6: Update API Documentation
File: docs/gns3-copilot/llm-model-configs-api.md
Add inherited_from field description in response schema section:
### LLMModelConfigWithSource
| Field | Type | Description |
|-------|------|-------------|
| ...
| `inherited_from` | UUID (nullable) | For shadow configs, the ID of the inherited group config |
Code Changes Checklist
Files to Modify
| File Path | Change Type | Description |
|---|---|---|
gns3server/db/models/llm_model_configs.py |
Modify | Add inherited_from_config_id field and relationship |
gns3server/db/repositories/llm_model_configs.py |
Modify | Modify set_user_default_config and get_user_effective_configs |
gns3server/db/tasks.py |
Modify | Modify get_user_llm_config_full to support shadow configs |
gns3server/schemas/... |
Modify (Optional) | Add inherited_from field to Schema |
gns3server/db_migrations/versions/... |
New | Database migration file |
docs/gns3-copilot/llm-model-configs-api.md |
Modify | Update API documentation |
New Files
| File Path | Description |
|---|---|
gns3server/db_migrations/versions/{timestamp}_add_inherited_from_config_id.py |
Database migration |
Testing Plan
Unit Tests
1. Test set_user_default_config
-
Test 1.1: User sets their own config as default
- Input: User's config ID
- Expected:
is_default=true, old shadow configs deleted
-
Test 1.2: User sets group config as default
- Input: Group config ID
- Expected: Shadow config created,
inherited_from_config_idpoints to group config
-
Test 1.3: User switches default config (from own to group config)
- Input: Group config ID
- Expected: Old shadow config deleted, new shadow config created
-
Test 1.4: User sets non-existent config as default
- Input: Invalid config ID
- Expected: Returns
False
-
Test 1.5: User sets inaccessible config as default
- Input: Other user's group config ID
- Expected: Returns
False
2. Test get_user_effective_configs
-
Test 2.1: User with only own configs
- Expected: Returns user configs, no
inherited_fromfield
- Expected: Returns user configs, no
-
Test 2.2: User with inherited group configs, no default set
- Expected: Returns user configs + group configs,
default_configis first user config or first group config
- Expected: Returns user configs + group configs,
-
Test 2.3: User set group config as default (shadow config)
- Expected: Shadow config
source="user",is_default=true,inherited_frompoints to group config, API key isnull
- Expected: Shadow config
-
Test 2.4: User viewing own configs (API key visibility)
- Expected: Own config shows API key, shadow config and group config hide API key
3. Test get_user_llm_config_full
-
Test 3.1: User using own default config
- Expected: Returns config with decrypted API key
-
Test 3.2: User using shadow config (group config)
- Expected: Retrieves and decrypts API key from original group config
-
Test 3.3: Shadow config's original group config deleted
- Expected: Returns
Noneor appropriate error handling
- Expected: Returns
Integration Tests
1. API Endpoint Tests
-
Test 1.1:
PUT /users/{user_id}/llm-model-configs/default/{group_config_id}- Request: Set group config as default
- Expected: Returns 200, config set as default
-
Test 1.2:
GET /users/{user_id}/llm-model-configs- Expected: Shadow config appears in list,
source="user",inherited_fromfield exists
- Expected: Shadow config appears in list,
-
Test 1.3:
GET /users/{user_id}/llm-model-configs/default- Expected: Returns shadow config
2. Agent Integration Tests
-
Test 2.1: User using shadow config calls Agent
- Expected: Agent successfully retrieves config and calls LLM
-
Test 2.2: Multiple users using same group config as default
- Expected: Each user has their own shadow config, no interference
Security Tests
- Test 1: User views config list, shadow config's API key is hidden
- Test 2: Admin views other user's config, API key is hidden
- Test 3: User cannot set other user's config as default
- Test 4: Cascading delete: Group config deleted, shadow config auto-deleted
Risk Assessment
Technical Risks
| Risk | Impact | Probability | Mitigation |
|---|---|---|---|
| Database migration failure | High | Low | Thoroughly test migration script, prepare rollback plan |
| Shadow config out of sync with original config | Medium | Medium | Shadow config dynamically reads from original config, real-time sync |
| API key decryption failure | High | Low | Add error handling and logging |
| Performance impact | Low | Low | Limited number of shadow configs, negligible performance impact |
Business Risks
| Risk | Impact | Probability | Mitigation |
|---|---|---|---|
| User confusion (shadow config vs own config) | Medium | Medium | Clearly indicate inheritance source in UI |
| Users unaware of group config updates | Low | Low | Document behavior, or add config version notification in the future |
Compatibility Risks
| Risk | Impact | Probability | Mitigation |
|---|---|---|---|
Existing API clients incompatible with inherited_from field |
Low | Low | Field is optional, old clients can ignore it |
| Agent doesn't support shadow config | High | Low | Agent retrieves config via user_id, automatically compatible |
Future Enhancements
Potential Future Features
- Config Overrides: Allow users to override certain parameters in shadow config (e.g.,
temperature) - Change Notifications: Notify users when group config is updated
- Config Version Tracking: Record change history of configs
- Config Recommendations: Recommend default configs based on usage patterns
Related Features
- Support user config templates (create own config based on group config)
- Config import/export functionality
- Batch config management
References
- LLM Model Configs API
- AI Chat API Design
- SQLAlchemy Foreign Key: https://docs.sqlalchemy.org/en/14/core/metadata.html
- Alembic Migrations: https://alembic.sqlalchemy.org/en/latest/tutorial.html
Document Version: 1.0 Last Updated: 2026-03-06
License
Copyright © 2025 Yue Guobin (岳国宾)
This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License (CC BY-SA 4.0).
Summary
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Full license text: DESIGN_DOCS_LICENSE
