Add configurable defaults for infer and custom update prompt

[frederikb96]

Description

This PR adds configurable default values for the infer parameter and custom deduplication prompts in OpenMemory, allowing users to control default behavior system-wide through the Settings UI.

Features:

• default_infer setting: Controls whether LLM processing (fact extraction & deduplication) is enabled by default when infer parameter is not specified in API/MCP calls
• custom_update_memory_prompt setting: Allows customizing the deduplication phase prompt (ADD/UPDATE/DELETE/NONE decisions)
• Comprehensive parameter descriptions: Added detailed descriptions for LLM agents to understand parameter behavior
• Settings UI: Added intuitive controls in the Settings page for both configuration options

Implementation:

• REST API and MCP endpoints use Optional[bool] = None pattern for infer parameter
• Config values loaded from PostgreSQL database and passed to mem0 core
• Fallback chain: explicit parameter → database config → hardcoded default (True)
• Proper None-checking to handle False values correctly

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• Test Script (please provide)
• Tested with custom MCP test script that verifies default_infer config behavior
• Manually tested Settings UI toggles and verified behavior changes
• Tested both TRUE and FALSE values for default_infer setting
• Verified custom prompts are properly loaded and applied

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have checked my code and corrected any misspellings

[parshvadaftari]

Can you please incorporate the changes? Thanks!

[frederikb96]

However, I realized that there was a bug introduced recently in commit 639d26e from @vedant381

In this screenshot, the lines 175-177 on the right side originally belonged to the PUT function. But there was a copy-paste error which led to moving the lines instead of copying them to
the new PATCH function :D

I also fixed it with another commit on this branch since this would otherwise break the whole config 🙂 Took me some time to figure that out - it was a difficult diff to read due to how diff showed only new lines introduced 😄

[frederikb96]

Here test results:

Keep default toggled on in GUI:

And test:

mem0/.claude/tests on  feature/configurable-defaults [$⇕] via 🐍 v3.14.0 (.venv) 
❯ python 01-test-mcp-basic.py 

=== STEP 1: Delete All Memories ===
Result: meta=None content=[TextContent(type='text', text='Successfully deleted all memories', annotations=None, meta=None)] structuredContent={'result': 'Successfully deleted all memories'} isError=False

=== STEP 2: Add Memory ===
Input: The user likes coding and playing chess.

Result:
{
  "results": [
    {
      "id": "d2ee7eba-3e02-440f-a9e1-f9bdce7f9481",
      "memory": "Likes coding",
      "event": "ADD"
    },
    {
      "id": "8496d85f-2243-4cf4-87ff-df0641713bdd",
      "memory": "Likes playing chess",
      "event": "ADD"
    }
  ]
}

=== STEP 3: Search ===
Query: coding

Result:
{
  "results": [
    {
      "id": "d2ee7eba-3e02-440f-a9e1-f9bdce7f9481",
      "memory": "Likes coding",
      "hash": "92852dc8b92358ffee81ce58fbc73578",
      "created_at": "2025-10-23T11:40:55.312652-07:00",
      "updated_at": null,
      "score": 0.50719327
    },
    {
      "id": "8496d85f-2243-4cf4-87ff-df0641713bdd",
      "memory": "Likes playing chess",
      "hash": "c78f844272f9e64847ef334a355a283e",
      "created_at": "2025-10-23T11:40:55.345992-07:00",
      "updated_at": null,
      "score": 0.22972144
    }
  ]
}

Disable toggle:

And test:

mem0/.claude/tests on  feature/configurable-defaults [$+⇕] via 🐍 v3.14.0 (.venv) took 15s 
❯ python 01-test-mcp-basic.py 

=== STEP 1: Delete All Memories ===
Result: meta=None content=[TextContent(type='text', text='Successfully deleted all memories', annotations=None, meta=None)] structuredContent={'result': 'Successfully deleted all memories'} isError=False

=== STEP 2: Add Memory ===
Input: The user likes coding and playing chess.

Result:
{
  "results": [
    {
      "id": "413e3134-e8b1-4b5a-8403-f6898b7701d7",
      "memory": "The user likes coding and playing chess.",
      "event": "ADD",
      "actor_id": null,
      "role": "user"
    }
  ]
}

=== STEP 3: Search ===
Query: coding

Result:
{
  "results": [
    {
      "id": "413e3134-e8b1-4b5a-8403-f6898b7701d7",
      "memory": "The user likes coding and playing chess.",
      "hash": "3b5858fa6ab952f234ba78fe62eedf29",
      "created_at": "2025-10-23T11:41:15.415382-07:00",
      "updated_at": null,
      "score": 0.3419581
    }
  ]
}