Password not saved when creating new source via POST API (works with PATCH)

[LeoLong0325]

Bug Description

Password is not saved when creating a new data source via POST API, but works correctly when updating via PATCH API.

Environment

• Chronograf: 1.10.7
• InfluxDB: 1.8.10(Enterprise)

Steps to Reproduce

1. Create a new source with password:

curl -X POST 'http://localhost:8888/chronograf/v1/sources' \
  -H 'Content-Type: application/json' \
  -d '{
    "name": "Test Source",
    "type": "influx-enterprise",
    "username": "admin",
    "password": "admin",
    "url": "http://192.168.213.72:8086",
    "metaUrl": "http://192.168.2.181:8091/",
    "telegraf": "telegraf"
  }'

2. Check user permissions:

curl 'http://localhost:8888/chronograf/v1/sources/{id}/users'

Expected: Users should have permissions listed
Actual: All users show empty permissions: "permissions": []

Workaround

Update password via PATCH after creation:

curl -X PATCH 'http://localhost:8888/chronograf/v1/sources/{id}' \
  -H 'Content-Type: application/json' \
  -d '{"password": "admin"}'

After PATCH, permissions load correctly.

Impact

• Every new data source requires an additional PATCH request
• UI shows "Value saved in server" but password is not actually saved
• User permissions cannot be viewed until password is manually updated

Root Cause Analysis

The password appears to be lost somewhere in the NewSource function flow in server/sources.go. The UpdateSource function works correctly because it explicitly checks and updates the password field:

// UpdateSource - works correctly
if req.Password != "" {
    src.Password = req.Password
}

However, in NewSource, the password is somehow not persisted to the database despite being present in the request.