Add view and materialized view support (PlantUML)

[kurotych]

#13

[Copilot]

Pull Request Overview

Adds support for SQL views and materialized views throughout the loader, schema structures, tests, and both PlantUML and Mermaid generators.

• Extend SqlERData and sql_entities with a new View type and a views field.
• Update the PostgreSQL ERD loader to fetch and classify both standard and materialized views.
• Enhance PlantUML and Mermaid generators (and tests) to render views; bump version to 0.6.0.

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/test_db.sql	Added CREATE VIEW and CREATE MATERIALIZED VIEW DDL.
tests/sql_loader_test.rs	New views() async test validating both view types.
src/sql_entities.rs	Introduced View struct and views in SqlERData.
src/psql_erd_loader.rs	Loader now queries and separates views and matviews.
src/plantuml_generator.rs	Templates and rendering logic updated for views.
src/mermaid_generator.rs	ViewGenerator impl updated; minor template trim tweak.
docker-compose.yml	Upgraded Postgres image to postgres:17.4.
README.md	Updated example PlantUML link.
Cargo.toml	Bumped version from 0.5.0 to 0.6.0.

Comments suppressed due to low confidence (1)

src/psql_erd_loader.rs:452

• Materialized views are also returned by the VIEW type query and then added again after pg_matviews, which will duplicate entries. Filter out materialized views from this branch (e.g. by checking against your mat_views list) to avoid duplicates.

TableType::View => {

[Copilot]

This block re-collects table_names_with_types but it was already built earlier—consider reusing the initial vector instead of duplicating the query for clarity and reduced overhead.

Suggested change

	// Collect table names and types as a vector of tuples
	let table_names_with_types: Vec<(String, TableType)> = res
	.iter()
	.map(|row| (row.get("table_name"), row.get("table_type")))
	.collect();
	// Reuse the previously collected table_names_with_types vector

[Copilot]

[nitpick] This placeholder comment appears to be a leftover note. Consider removing or clarifying it to keep comments directly relevant.

Suggested change

	// entities can be renamed to "tables"