Widen collector columns to match DMV documentation

[erikdarlingdata]

Summary

• Full audit of all collector table schemas against Microsoft DMV documentation
• Widened 6 SQL Server columns and 2 Lite DuckDB columns that were narrower than documented DMV types
• Added idempotent upgrade script (02_widen_audit_columns.sql) for existing installations

SQL Server fixes

Table	Column	Old	New	DMV Source
cpu_scheduler_stats	total_work_queue_count	int	bigint	dm_os_schedulers.work_queue_count
cpu_scheduler_stats	total_active_parallel_thread_count	int	bigint	dm_resource_governor_workload_groups
cpu_scheduler_stats	system_memory_state_desc	nvarchar(120)	nvarchar(256)	dm_os_sys_memory
waiting_tasks	resource_description	nvarchar(1000)	nvarchar(3072)	dm_os_waiting_tasks
database_size_stats	recovery_model_desc	nvarchar(12)	nvarchar(60)	sys.databases
database_size_stats	volume_mount_point	nvarchar(256)	nvarchar(512)	dm_os_volume_stats

Lite fixes

Table	Column	Old	New	Reason
tempdb_stats	total_sessions_using_tempdb	INTEGER	BIGINT	COUNT_BIG result, removed (int) narrowing cast
session_stats	connection_count	INTEGER	BIGINT	COUNT_BIG result, switched to Convert.ToInt64

Files changed

• install/02_create_tables.sql — fresh install definitions
• install/06_ensure_collection_table.sql — ensure procedure definitions
• install/52_collect_database_size_stats.sql — Azure SQL DB CONVERT width
• Lite/Database/Schema.cs — DuckDB schema
• Lite/Services/RemoteCollectorService.TempDb.cs — narrowing cast fix
• Lite/Services/RemoteCollectorService.SessionStats.cs — narrowing cast fix
• upgrades/2.2.0-to-2.3.0/02_widen_audit_columns.sql — idempotent upgrade

Test plan

• Upgrade script tested on sql2022 — all 6 columns widened
• Idempotency verified — second run is no-op
• Dashboard builds clean (0 errors)
• Lite builds clean (0 errors)

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