Extend postgres context

[Jaizkibel]

Description

Adds more information to PostgreSQL Context.
Added for tables

• Indexes
• Foreign Keys
• Triggers
• Comments

Added for views

• Select statement used to create the view

Added context for materialized views with

• List of columns
• Indexes
• Sample rows
• Comments
• Salect statement used to create materialized view

Other changes

• "All tables" item at top of submenue list
• Optional "excludePattern" for postgres context config to exclude matching tables/views from context
• No sample rows for views. Selects on views without where clause may take long time.

See attached context examples from Sakila db:
table_example.txt
view_example.txt
mat_view_example.txt

Checklist

• The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

Screenshots

[ For visual changes, include screenshots. ]

Testing instructions

1. Add a "postgres" context provider with connection properties
2. Send a chat prompt with context @Postgres (all tables)
3. Check if provided context contains all expected informations (see example)
4. Add a "excludePattern" property to postgres config
5. Send another prompt with @Postgres
6. Check if tables/views with names matching the pattern are excluded from context

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