Fix PostgreSQL replication parameter detection in namespace mode

[Copilot]

The namespace mode was not correctly identifying PostgreSQL replication parameters when users asked queries like "Show me if the parameter my PostgreSQL server has replication enabled". While the default mode properly analyzed the wal_level parameter and reported "Replication is ENABLED", the namespace mode only returned basic server configuration without replication analysis.

Problem

The issue occurred because namespace mode uses ServerToolLoader which routes commands differently than default mode. When users asked about replication status, the system would look for a literal parameter named "replication enabled" rather than analyzing the actual PostgreSQL replication configuration parameters like wal_level.

Default mode behavior (working):

• Correctly identifies wal_level = replica
• Reports "Replication is ENABLED"
• Provides detailed replication parameter analysis

Namespace mode behavior (broken):

• Shows basic server configuration
• Reports "replication is not enabled"
• Missing replication parameter analysis

Solution

This PR implements comprehensive PostgreSQL replication detection logic that works consistently across both modes:

1. Enhanced PostgreSQL Service

• Added GetReplicationStatusAsync() method that analyzes key replication parameters:
  • wal_level (must be 'replica' or 'logical' for replication to be enabled)
  • max_wal_senders (number of concurrent replica connections allowed)
  • max_replication_slots (replication slot configuration)

2. Smart Query Detection

• Enhanced GetParamCommand to detect replication-related queries using keywords like "replication", "replica", "wal_level", "enabled"
• Added fallback logic: if a parameter doesn't exist but the query seems replication-related, provides comprehensive replication analysis instead of an error

3. Dedicated Replication Command

• Added new ReplicationStatusCommand for explicit replication status checking
• Registered as postgres server replication-status for direct access

4. Comprehensive Analysis Output

The fix now provides detailed replication status analysis in both modes:

✅ Replication is ENABLED

Key Replication Parameters:

1. wal_level: replica
   ○ This setting enables replication functionality
   ○ 'replica' level allows for streaming replication and point-in-time recovery

2. max_wal_senders: 10
   ○ Allows up to 10 concurrent WAL sender processes
   ○ This means the server can support up to 10 replica connections

Summary: Your PostgreSQL server has replication enabled and properly configured.

Testing

Added comprehensive unit tests covering:

• Direct wal_level parameter queries
• "replication enabled" type queries (from the issue)
• Parameter not found fallback scenarios
• Various WAL level values (replica, logical, minimal)
• Dedicated replication status command

All tests verify that both default and namespace modes now provide identical, comprehensive replication analysis.

Fixes #573.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• 0t3vsblobprodcus362.vsblob.vsassets.io
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• pe4vsblobprodcus351.vsblob.vsassets.io
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If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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[jongio]

Closing this will have the postgres folks address it