feat(drivers-memory-conversation-dakera): add DakeraConversationMemoryDriver

[ferhimedamine]

Problem

Griptape's BaseConversationMemoryDriver lets applications persist Conversation Memory to an external store (Local JSON, Amazon DynamoDB, Redis, Griptape Cloud). There's currently no driver for Dakera, a self-hosted memory server that a number of Griptape users run alongside their agents. Today they have to write their own glue to persist conversations to it.

Design

This PR adds DakeraConversationMemoryDriver, mirroring the structure of the existing RedisConversationMemoryDriver and GriptapeCloudConversationMemoryDriver:

• Each conversation is stored under its own conversation_id, which is used as the Dakera agent_id, so conversations stay isolated from one another.
• store(runs, metadata) serializes the conversation via the base class's _to_params_dict and replaces the previous snapshot (deletes prior entries, then writes the latest one), matching the overwrite semantics of the Redis/DynamoDB drivers.
• load() reads back the most recent snapshot and reconstructs it with _from_params_dict, returning ([], {}) when nothing is stored.
• The Dakera client is a lazily-constructed optional dependency (import_optional_dependency("dakera")), gated behind the new drivers-memory-conversation-dakera extra. base_url / api_key fall back to DAKERA_BASE_URL (default http://localhost:3000) and DAKERA_API_KEY.

Dakera is self-hosted via the dakera-deploy Docker Compose stack; the Python SDK is dakera.

Usage

import os
import uuid

from griptape.drivers.memory.conversation.dakera import DakeraConversationMemoryDriver
from griptape.memory.structure import ConversationMemory
from griptape.structures import Agent

dakera_conversation_driver = DakeraConversationMemoryDriver(
    base_url=os.environ["DAKERA_BASE_URL"],  # e.g. http://localhost:3000
    api_key=os.environ["DAKERA_API_KEY"],
    conversation_id=uuid.uuid4().hex,
)

agent = Agent(conversation_memory=ConversationMemory(conversation_memory_driver=dakera_conversation_driver))
agent.run("My name is Jeff.")
agent.run("What is my name?")  # a fresh Agent with the same conversation_id reloads the history

Testing

• New unit tests in tests/unit/drivers/memory/conversation/test_dakera_conversation_memory_driver.py (store, snapshot replacement, load, empty-load, and validation) — all pass, following the same mocked-client pattern as the Redis driver tests.
• ruff format --check, ruff check, pyright, typos, and mdformat --check all clean locally against the pinned versions in uv.lock.
• uv.lock regenerated to include the new optional dependency.

Checklist

• New driver mirrors an existing sibling (RedisConversationMemoryDriver) and its base class
• Registered in griptape/drivers/__init__.py (__all__) and re-exported from the dakera subpackage
• drivers-memory-conversation-dakera extra added; included in all; uv.lock updated
• Unit tests added and passing
• Docs section + runnable example added to conversation-memory-drivers.md
• Lint / format / type / spell checks pass locally

---

📚 Documentation preview 📚: https://griptape--2228.org.readthedocs.build//2228/

[codecov]

Codecov Report

❌ Patch coverage is 97.05882% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
.../conversation/dakera_conversation_memory_driver.py	96.77%	0 Missing and 1 partial ⚠️

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