Updated documentation.

Author: kenstott

README.md

@@ -1,79 +1,85 @@
-# Hasura SQL Integration Suite
+# Hasura Integration Suite
 
-A comprehensive collection of tools and adapters for enabling SQL access to GraphQL and other data sources through Apache Calcite.
+Tools for integrating with Hasura Data Delivery Network (DDN) in two key ways:
+1. Native Data Connector (NDC) toolkit for ingesting data sources into Hasura DDN
+2. SQL-based tools for querying Hasura DDN endpoints
 
-## Components
+## Native Data Connector Development
 
-### 1. [Hasura GraphQL SQL Adapter](calcite-rs-jni/calcite/graphql/README.md)
-SQL:2003 compliant system that enables Apache Calcite to query Hasura GraphQL endpoints using SQL. Features include:
+### [NDC Calcite](ndc-calcite.md)
+A toolkit for creating Hasura DDN Native Data Connectors using Apache Calcite:
+- Support for developing connectors to 15+ file-based data sources
+- Support for developing connectors to 25+ JDBC-based data sources
+- Metadata-configurable adapter framework
+- Built-in testing and validation tools
+- Comprehensive connector development documentation
+
+#### Supported Data Sources for NDC Development
+
+File Formats:
+| Format    | Status  | Features |
+|-----------|---------|----------|
+| Arrow     | Tested  | File mount, High Performance |
+| CSV       | Tested  | S3, HTTP, file mount, Redis caching |
+| JSON      | Tested  | S3, HTTP, file mount, Redis caching |
+| XLSX      | Tested  | S3, HTTP, file mount, Redis caching |
+| Parquet   | Tested  | File mount (S3 support possible) |
+
+Databases:
+- PostgreSQL (Tested)
+- Redshift (Tested)
+- Databricks (Tested)
+- Trino (Tested)
+- HIVE (Tested)
+- DB2 (Tested)
+- SQLite (Tested)
+- H2 (Tested)
+- Cassandra (Tested)
+
+[View full database support matrix](ndc-calcite.md#databases)
+
+## SQL Access Tools for Hasura DDN
+
+### [Hasura GraphQL SQL Adapter](calcite-rs-jni/calcite/graphql/README.md)
+Apache Calcite adapter optimized for querying Hasura DDN endpoints using SQL:
 - SQL:2003 compliance with extensive feature support
 - Window functions and common table expressions
 - Flexible caching system (in-memory and Redis)
 - Advanced query optimization
 - Comprehensive type system
 
-### 2. [GraphQL JDBC Connector](calcite-rs-jni/jdbc/README.md)
-JDBC driver for SQL access to GraphQL endpoints, offering:
-- Standard JDBC interface for GraphQL data
+### SQL Access Interfaces
+
+#### JDBC Connector
+JDBC driver for SQL access to Hasura DDN endpoints:
+- Standard JDBC interface
 - Authentication via headers (Bearer tokens, API keys)
 - Role-based access control
 - Query result caching
 - Integration with standard JDBC tooling
 
-### 3. [Python DB-API](calcite-rs-jni/py_graphql_sql/README.md)
+#### Python DB-API
 Python DB-API 2.0 implementation for SQL access to Hasura DDN endpoints:
 - Python 3.9+ support
 - Context manager support
 - Type hints for better IDE integration
 - Clear error handling
 - Thread-safe design
 
-### 4. [SQL HTTP Server](calcite-rs-jni/sqlengine/README.md)
-Lightweight HTTP server for executing SQL queries via REST:
+#### SQL HTTP Server
+Lightweight HTTP server for executing SQL queries against Hasura DDN endpoints via REST:
 - JSON-based request/response format
 - Read-only query execution
 - Authentication and role-based access
 - Connection pooling
 - Environment-based configuration
 
-### 5. [NDC Calcite](ndc-calcite.md)
-Metadata-configurable adapter supporting ~40 data sources:
-- 15+ file-based data sources
-- 25+ JDBC-based data sources
-- Support for various databases and file formats
-
-## Supported Data Sources
-
-### File Formats
-| Format    | Status  | Features |
-|-----------|---------|----------|
-| Arrow     | Tested  | File mount, High Performance |
-| CSV       | Tested  | S3, HTTP, file mount, Redis caching |
-| JSON      | Tested  | S3, HTTP, file mount, Redis caching |
-| XLSX      | Tested  | S3, HTTP, file mount, Redis caching |
-| Parquet   | Tested  | File mount (S3 support possible) |
-
-### Databases
-Notable supported databases include:
-- PostgreSQL (Tested)
-- Redshift (Tested)
-- Databricks (Tested)
-- Trino (Tested)
-- HIVE (Tested)
-- DB2 (Tested)
-- SQLite (Tested)
-- H2 (Tested)
-- Cassandra (Tested)
-
-[View full database support matrix](ndc-calcite.md#databases)
-
 ## Getting Started
 
 Each component has its own setup and configuration requirements. Please refer to the individual component documentation linked above for detailed instructions.
 
-## Common Features Across Components
+## Common Features
 
-- SQL:2003 compliance
 - Authentication and authorization support
 - Query result caching
 - Clear error handling
@@ -83,11 +89,10 @@ Each component has its own setup and configuration requirements. Please refer to
 ## Development
 
 For development setup and contribution guidelines, please refer to each component's documentation:
-- [Calcite Adapter Contributing Guide](ndc-calcite.md#contributing)
+- [NDC Calcite Development](ndc-calcite.md#temporary-instructions---for-getting-started-as-a-developer-with-this-repo)
 - [JDBC Connector Development Guide](calcite-rs-jni/jdbc/README.md#building-from-source)
 - [Python DB-API Development](calcite-rs-jni/py_graphql_sql/README.md#prerequisites)
 - [SQL HTTP Server Development](calcite-rs-jni/sqlengine/README.md#building-and-running)
-- [NDC Calcite Development](ndc-calcite.md#temporary-instructions---for-getting-started-as-a-developer-with-this-repo)
 
 ## License