Duckie: Implement Metaphor API for Hour-Ahead Prediction with Streaming Capability

[duckie-ai-helper]

• Understand the existing structure and functioning of the current batch mode in the API.
• Extend the API to support both batch mode and streaming mode, with the ability to toggle between the two. The streaming mode should be able to handle JSON data and run continuously when activated.
• Establish a frequency for rotating streaming prompts in either a continuous or segmented time interval manner.
• Identify and incorporate 20 prompts that will act as "self-indexing, stigmeric artifacts" in the rotation. The source of these prompts needs clarification (incoming JSON data vs. internally generated).
• Update the API configuration to ensure smooth, continuous JSON streaming.
• Validate the newly implemented streaming service through thorough testing to ensure functionality and reliability.

[bmorphism]

please populate the tests