Fix namespace qualification and add provider-wide namespace tests

.github/scripts/test.ps1

@@ -8,7 +8,7 @@ $databases = @('SQLite','SQLServer','PostgreSQL','Oracle','MySQL','MariaDB','Fir
 $filter = if ($Database -eq 'Unit') { ($databases | ForEach-Object { "TestCategory!=$_" }) -join '&' } else { "TestCategory=$Database" }
 $xmlDirectory = Join-Path (Get-Location) "TestResults/$Database"
 $coverageArguments = if ($Coverage) { @('--collect', 'XPlat Code Coverage', '--settings', "$PSScriptRoot/../coverage.runsettings") } else { @() }
-dotnet test Migrator.slnx --no-build --filter $filter --logger "trx;LogFileName=$Database.trx" --results-directory TestResults @coverageArguments -- NUnit.NumberOfTestWorkers=0 "NUnit.TestOutputXml=$xmlDirectory"
+dotnet test Migrator.slnx --no-build --filter $filter --logger "trx;LogFileName=$Database.trx" --logger "console;verbosity=normal" --results-directory TestResults @coverageArguments -- NUnit.NumberOfTestWorkers=0 "NUnit.TestOutputXml=$xmlDirectory"
 if ($LASTEXITCODE -ne 0) { throw "Tests failed for $Database" }
 [xml]$results = Get-Content "TestResults/$Database.trx"
 $counters = $results.TestRun.ResultSummary.Counters

docs/namespace-support.md

@@ -0,0 +1,91 @@
+# Namespace qualification
+
+A table argument can be unqualified (Orders) or qualified (sales.Orders).
+ProviderFactory.Create with defaultSchema applies the namespace to unqualified
+names only. Explicit qualification wins. Quote each identifier component
+separately when it contains dots, spaces or reserved words.
+
+GetTables() enumerates the configured namespace, or the connection's current
+namespace when none is configured. GetTables(schema) explicitly selects one
+namespace. GetColumns(schema, table) uses the same native catalog path as
+GetColumns(qualifiedTable), rather than assuming an ADO.NET driver's GetSchema
+restriction layout. Table enumeration returns local names.
+
+| Provider | Namespace model |
+| --- | --- |
+| SQL Server / SQL Server 2005 | Database schema; metadata follows qualified object identity |
+| PostgreSQL / PostgreSQL 8.2 selector | Database schema; unqualified lookup follows the search path |
+| Oracle / MsOracle | Schema owner; unquoted names fold to uppercase |
+| Db2 | Schema; unquoted names fold to uppercase |
+| Informix | Object owner; unquoted names fold to lowercase |
+| Sybase ASE | Object owner; enable QUOTED_IDENTIFIER for quoted SQL identifiers |
+| HANA | Database schema; preserves the provider's case-sensitive quoted-name convention |
+| MySQL / MariaDB | Database (SCHEMA is a synonym for DATABASE) |
+| SQLite / MonoSQLite | main, temp, or a connection-local ATTACH alias |
+| Firebird | The provider targets Firebird 5: namespaces are explicitly rejected, including configured defaults |
+| Ingres | Owner-qualified DDL and native table/view/column/constraint/index catalogs, including composite foreign keys and cross-owner references |
+
+Renaming keeps the source namespace when the new name is unqualified. It is not
+a portable API for moving tables between namespaces. ASE index removal and sp_rename require
+a connection in the object's owner namespace; an explicitly different owner is
+rejected before renaming. SQLite foreign keys cannot
+reference another attached database; that request fails before table creation.
+SQLite reconstruction keeps its temporary table, indexes, triggers and
+AUTOINCREMENT sequence in the original database and checks foreign keys across
+attached databases.
+
+## Tests and evidence
+
+- NamespaceProviderContractTests exercises every public provider selector,
+  including aliases and Ingres, with unqualified, qualified and default namespace
+  DDL, table/view lookup and enumeration. These are command contracts, not proof
+  of execution on an engine.
+- NamespaceLifecycleTests runs in all eleven existing database CI jobs. Each
+  engine gets unqualified, qualified, quoted-qualified and default-namespace
+  cases covering table creation/removal, enumeration, columns/defaults, inserts,
+  updates, views, column changes/renames/removal, PK/FK/unique/index metadata and
+  removal, table rename and data preservation. Firebird tests explicit rejection
+  for the three namespace modes and table rename (unsupported by Firebird 5).
+- NamespaceIsolationTests creates two namespaces with identical table, key
+  and index names on SQLite, SQL Server, PostgreSQL, MySQL, MariaDB, Db2 and HANA.
+  The provider default points at the second while changes target the first.
+- SQLiteNamespaceTests exercises both selectors with dotted ATTACH names,
+  reconstruction, triggers, index isolation, sequence high-water preservation,
+  qualified renames and rejection of cross-database foreign keys.
+- IngresMetadataTests executes the actual catalog SELECTs against SQLite tables
+  shaped like the documented Ingres catalogs. It tests owner isolation, composite
+  key order, constraint-backed versus ordinary unique indexes, included columns,
+  split CHECK/FK definition text, referential actions and quoted cross-owner names.
+  DDL contracts cover index creation/removal and restrictive column/constraint
+  drops. This is executable catalog coverage, not an Ingres engine simulation.
+- The Ingres lifecycle fixture can be enabled for a licensed instance as described
+  below. No live Ingres run has been performed. Firebird 6 schema support likewise
+  requires separate version qualification.
+
+## Running the Ingres lifecycle suite
+
+The [official Ingres image](https://hub.docker.com/r/actian/ingres) requires a
+commercial license and license key. It is not added to the public CI matrix.
+Use a licensed test installation with an empty, disposable owner namespace and
+a current Actian .NET driver compatible with .NET 9. Set MIGRATOR_INGRES_DRIVER
+to the driver's assembly path and MIGRATOR_INGRES to its connection string, then:
+
+```powershell
+dotnet test src/Migrator.Tests/Migrator.Tests.csproj -p:LiveDatabase=Ingres --filter 'TestCategory=Ingres'
+```
+
+This enables the four existing lifecycle cases (unqualified, qualified,
+quoted-qualified and default namespace). Missing configuration fails explicitly;
+the suite does not turn missing connectivity into passing or skipped tests.
+Setup refuses a nonempty owner namespace and each case rolls back its DDL.
+The optional fixture is not compiled into normal CI discovery.
+
+The implementation uses Actian's documented [standard catalogs](https://docs.actian.com/ingres/11.0/DatabaseAdmin/Standard_Catalogs_for_All_Databases.htm).
+Ingres secondary indexes support key and non-key columns; clustered and filtered
+index requests are rejected explicitly. DROP COLUMN and DROP CONSTRAINT use
+RESTRICT, so dependent objects must be removed by the caller first. Renaming is
+also subject to the engine's dependency restrictions.
+
+Related issue: [#48](https://github.com/dotnetprojects/Migrator.NET/issues/48).
+This matrix describes the tests added here, not a claim that every possible
+identifier, database version or schema-changing operation is covered.

src/Migrator.Tests/Database/DerivedDatabaseIntegrationTestServices/OracleDatabaseIntegrationTestService.cs

@@ -99,7 +99,7 @@ public override async Task<DatabaseInfo> CreateTestDatabaseAsync(DatabaseConnect
 
         await Parallel.ForEachAsync(
             toBeDeletedUsers,
-            new ParallelOptions { MaxDegreeOfParallelism = 3, CancellationToken = cancellationToken },
+            new ParallelOptions { MaxDegreeOfParallelism = 1, CancellationToken = cancellationToken },
             async (x, cancellationTokenInner) =>
             {
                 var databaseInfoToBeDeleted = new DatabaseInfo