Add missing level property to entity cache schema

[Copilot]

Why make this change?

The level property for entity caching is fully implemented in the codebase (EntityCacheOptions, converters, runtime service) but missing from the JSON schema, causing validation warnings in IDEs and dab validate despite the property working correctly at runtime.

What is this change?

Added level property definition to entity cache section in schemas/dab.draft.schema.json (lines 1123-1128), matching the existing template cache section:

"level": {
  "type": "string",
  "description": "Cache level (L1 or L1L2)",
  "enum": [ "L1", "L1L2", null ],
  "default": "L1L2"
}

Modified Files:

• schemas/dab.draft.schema.json (+6 lines)

Schema now validates cache level configurations:

• L1: In-memory cache only (single-instance)
• L1L2: In-memory + distributed cache (multi-instance with Redis)

How was this tested?

• Unit Tests
• Integration Tests

All 49 cache configuration tests pass. Schema validation tests pass. Manual validation confirms proper acceptance of valid values (L1, L1L2) and rejection of invalid values.

Sample Request(s)

Entity configuration with cache level now validates correctly:

{
  "entities": {
    "Book": {
      "source": { "object": "books", "type": "table" },
      "cache": {
        "enabled": true,
        "ttl-seconds": 10,
        "level": "L1"
      },
      "permissions": [...]
    }
  }
}

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• xxxxx
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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Missing level section in entities property</issue_title>
<issue_description>The entities property inside of the schema file is missing the level section for caching. Everything else related to this feature is already implemented, so it is only necessary to add the level property to the schema file and ensure to add tests related to this property if they are missing.</issue_description>

<agent_instructions>Fix with as little new code as possible</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@JerryNixon ### Current State

The level property for entity caching is already fully implemented in the code, but it's missing from the JSON schema file (schemas/dab.draft.schema.json) that validates DAB configuration files.

What Already Works

Looking at the code, the level property is:

1. Defined in the model:

/// <summary>
/// The cache levels to use for a cache entry.
/// </summary>
[JsonPropertyName("level")]
public EntityCacheLevel? Level { get; init; } = null;

2. Serialized/Deserialized properly:

// Reads the "level" property from JSON
case "level":
    reader.Read();
    if (reader.TokenType is JsonTokenType.Null)
    {
        throw new JsonException("level property cannot be null.");
    }
    level = EnumExtensions.Deserialize<EntityCacheLevel>(reader.DeserializeString(_replacementSettings)!);
    break;

3. Used at runtime:

if (cacheEntryLevel == EntityCacheLevel.L1)
{
    ctx.Options.SetSkipDistributedCache(true, true);
}

4. Has working tests:

Cache: {
  Enabled: true,
  TtlSeconds: 1,
  Level: L1L2,
  UserProvidedLevelOptions: false
}

What's Missing

The JSON schema file does include level in the template section but NOT in the main entity cache configuration:

"cache": {
  "type": "object",
  "description": "Cache configuration",
  "additionalProperties": false,
  "properties": {
    "enabled": {
      "type": "boolean",
      "description": "Enable/disable caching",
      "default": false
    },
    "ttl-seconds": {
      "type": [ "integer", "null" ],
      "description": "Time-to-live for cached responses in seconds",
      "default": null,
      "minimum": 1
    },
    "level": {
      "type": "string",
      "description": "Cache level (L1 or L1L2)",
      "enum": [ "L1", "L1L2", null ],
      "default": "L1L2"
    }
  }
}

This is only in the template section. The main entities schema likely needs the same property added.

How It Should Be Used

{
  "entities": {
    "Book": {
      "source": { "object": "books", "type": "table" },
      "cache": {
        "enabled": true,
        "ttl-seconds": 10,
        "level": "L1"  // ← This is the missing property in schema validation
      }
    }
  }
}

Cache levels:

• L1: In-memory cache only (faster, but not shared across instances)
• L1L2 (default): In-memory + distributed cache (Redis) for multi-instance scenarios

---

Workarounds

Since the functionality already works in the runtime but the schema validation might complain:

1. Just Use It (Recommended)

You can add the level property to your configuration file even if the schema doesn't validate it:

{
  "entities": {
    "MyEntity": {
      "cache": {
        "enabled": true,
        "ttl-seconds": 30,
        "level": "L1"
      }
    }
  }
}

DAB will read and honor it because the code implementation exists. The only downside is:

• Your IDE might show validation warnings
• The dab validate command might complain

2. Ignore Schema Validation Warnings

If you're using VS Code or another editor with JSON schema validation:

• The warning won't affect runtime behavior
• DAB will still parse and use the level pro...

• Fixes Missing level section in entities property #2981

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