Add MS-SQL Server support

[Copilot]

Implements the MS-SQL vendor adapter and migrations per plans/mssql-support-implementation.md, porting the SQL dialect differences from the original Scala implementation.

MsSqlServerAdapter

New sealed subclass of SQLVendorAdapter with MS-SQL specific query syntax:

• Row limiting: TOP N instead of LIMIT N — overrides selectByKey, selectAllAvailableWithLock, selectFirstAvailableWithLock, acquireManyOptimistically
• Locking: WITH (UPDLOCK) on selectForUpdateOneRow, WITH (UPDLOCK, READPAST) on poll queries to prevent concurrent pollers from blocking on the same row
• Conditional insert: IF NOT EXISTS ... BEGIN INSERT ... END instead of insert-catch-duplicate

MsSqlServerMigrations

Table creation using MS-SQL types: NVARCHAR, DATETIMEOFFSET, BIGINT IDENTITY(1,1). Composite primary key (pKey, pKind) with a separate unique index on id, matching the old Scala schema.

Wiring

• SQLVendorAdapter.create() routes JdbcDriver.MsSqlServer to the new adapter
• DelayedQueueJDBC.runMigrations() routes to MsSqlServerMigrations
• selectByKey and selectAllAvailableWithLock made open on the base class to allow MS-SQL overrides

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

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

• docs.oracle.com
  • Triggering command: /usr/lib/jvm/temurin-21-jdk-amd64/bin/java /usr/lib/jvm/temurin-21-jdk-amd64/bin/java --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED --add-opens=java.xml/javax.xml.namespace=ALL-UNNAMED --add-opens=java.base/java.time=ALL-UNNAMED -XX:+UseParallelGC -Xmx2g -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en (dns block)
  • Triggering command: /usr/lib/jvm/temurin-21-jdk-amd64/bin/java /usr/lib/jvm/temurin-21-jdk-amd64/bin/java -XX:+HeapDumpOnOutOfMemoryError -XX:+AlwaysPreTouch @/home/REDACTED/.gradle/.tmp/gradle-worker-classpath229983155010189027txt -Xmx2g -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant worker.org.gradle.process.internal.worker.GradleWorkerMain 'Gradle Worker Daemon 3' (dns block)
• kotlinlang.org
  • Triggering command: /usr/lib/jvm/temurin-21-jdk-amd64/bin/java /usr/lib/jvm/temurin-21-jdk-amd64/bin/java --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED --add-opens=java.xml/javax.xml.namespace=ALL-UNNAMED --add-opens=java.base/java.time=ALL-UNNAMED -XX:+UseParallelGC -Xmx2g -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en (dns block)
  • Triggering command: /usr/lib/jvm/temurin-21-jdk-amd64/bin/java /usr/lib/jvm/temurin-21-jdk-amd64/bin/java -XX:+HeapDumpOnOutOfMemoryError -XX:+AlwaysPreTouch @/home/REDACTED/.gradle/.tmp/gradle-worker-classpath229983155010189027txt -Xmx2g -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant worker.org.gradle.process.internal.worker.GradleWorkerMain 'Gradle Worker Daemon 3' (dns block)

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)

Original prompt

Add support for MS-SQL.

• Follow the plan in: ./plans/mssql-support-implementation.md
• Respect best practices outlined in AGENTS.md

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