[FEATURE] GraphQL API — flexible query interface alongside existing REST API

[ElioNeto]

Description

ApexStore currently only has a REST API. Adding GraphQL would enable:

• Fetch multiple keys in a single request
• Project only needed fields from values (when values are JSON)
• Subscription to data changes (via WebSocket)
• Strongly typed queries via schema introspection

Proposed Implementation

1. Add async-graphql or juniper crate
2. Define GraphQL schema:

type Query {
  get(key: String!, cf: String): String
  keys(prefix: String, limit: Int): [String!]!
  scan(cf: String, start: String, end: String, limit: Int): [KV!]!
  stats: EngineStats!
}
type Mutation {
  put(key: String!, value: String!, cf: String): Boolean!
  delete(key: String!, cf: String): Boolean!
  flush: Boolean!
  compact: Boolean!
}
type Subscription {
  keyChanges(cf: String): ChangeEvent!
}

3. Mount GraphQL at /graphql and GraphiQL IDE at /graphiql

Labels

[ElioNeto]

Fixed in commit 1d8c830.