Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@packages/core/test/unit/dialects/db2/errors.test.js`:
- Line 14: Replace the hard-coded describe title with the dialect-aware helper
by wrapping the title string in Support.getTestDialectTeaser(...); specifically
update the describe call in the DB2-specific suite (the describe block that
currently reads "[DB2 Specific] UniqueConstraintError - error message parsing")
to use Support.getTestDialectTeaser('[DB2 Specific] UniqueConstraintError -
error message parsing') so the test title follows the project's dialect-specific
convention.

In `@packages/db2/src/query.js`:
- Around line 277-279: Guard against err being null/undefined before accessing
err.message: replace the current logic that does Object.assign(new
Error(err.message), err) with a safe approach that extracts a fallback message
(e.g., const message = err && err.message ? err.message : String(err)) and then
merges with a safe object (e.g., Object.assign(new Error(message), err || {}));
update the code that references err, Object.assign, and new Error to use this
guarded message and a fallback empty object to avoid throwing when err is
null/undefined.

In `@packages/ibmi/src/connection-manager.ts`:
- Around line 120-121: The validate method is calling a non-existent
connection.connected() on OdbcConnection; update validation to use a tracked
connection state or an operation check: add a boolean flag (e.g., isConnected)
to the IBMiConnection implementation, set it true in connect() and false in
close()/disconnect(), and change validate(connection: IBMiConnection) to return
connection.isConnected; alternatively, implement validate to perform a
lightweight try/catch operation (e.g., a no-op or simple query) on the
IBMiConnection and return true only if it succeeds, referencing the validate
method and the connect()/close()/query() methods on
IBMiConnection/OdbcConnection.

---

Nitpick comments:
In `@packages/db2/src/query.js`:
- Around line 276-299: The new implementation added to the JS source (the
formatError function in packages/db2/src/query.js) should be migrated to
TypeScript: move the updated logic into a new/renamed TypeScript module (e.g.,
packages/db2/src/query.ts), convert the function signature and local variables
to use proper TypeScript types (err: unknown|Error, conn typed for querySync,
parameters typed or any), update any imports/exports to reference the .ts
module, remove/adjust runtime-only JS patterns (Object.assign new Error casts)
to use typed guards and safe casting, and ensure the package build config
includes the .ts file so the compiled output replaces the JS implementation;
update tests/importers to point at the new module and remove the modified .js
implementation to satisfy the rule "write all new implementations in
TypeScript."

In `@packages/postgres/src/query.js`:
- Around line 24-71: The new query queueing logic was added in PostgresQuery.run
in the .js source and must be migrated into TypeScript instead of leaving it as
a new .js runtime behavior; move the implementation of connectionQueryQueues
(WeakMap) and the run(...) logic (including the alias minification loop,
runQuery promise, queuedQuery chaining, set on the WeakMap, and awaiting
queuedQuery) into the TypeScript version of the PostgresQuery class (keep the
same method name run and same semantics), add proper typings for connection,
parameters, options and result, and remove or replace the .js implementation so
the runtime behavior lives in the package’s .ts source.

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@packages/postgres/src/query.js`:
- Line 24: Queued queries continue to run on a destroyed client because the code
always advances to runQuery after the stored tail settles; update the queue
handling that uses the connectionQueryQueues WeakMap so that before invoking
runQuery (and before chaining the next task after the tail resolves) you check
the client's flags (e.g., client._invalid and client._ending) and immediately
fail/reject queued requests if either flag is set, and when the client is torn
down clear or reject the WeakMap entry for that client so no further chained
tasks run; locate code referencing connectionQueryQueues and runQuery and add
these checks and cleanup to fail fast.

---

Duplicate comments:
In `@packages/core/test/unit/dialects/db2/errors.test.js`:
- Line 14: The DB2-specific test suite title uses a plain string in the describe
call; update the suite title to use Support.getTestDialectTeaser(...) to follow
test conventions. Locate the describe('[DB2 Specific] UniqueConstraintError -
error message parsing', ...) and replace the string argument with
Support.getTestDialectTeaser('UniqueConstraintError - error message parsing')
(keeping the same inner description text) so the describe uses
Support.getTestDialectTeaser for dialect-specific naming.

---

Nitpick comments:
In `@packages/postgres/src/query.js`:
- Line 24: The connection queue implementation (the connectionQueryQueues
WeakMap and the queueing logic around enqueuing/dequeuing queries) must be moved
out of the legacy .js file into a new TypeScript module: re-implement the
WeakMap named connectionQueryQueues and the associated queue management
functions (enqueue/dequeue/flush semantics used by the existing query execution
code) in a .ts file, export those symbols, and update references in the codebase
to import the TypeScript exports instead of relying on the JS implementation;
ensure the exported API matches the current usage (function names and behavior)
so callers of the queueing logic need no behavioral changes.

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@packages/snowflake/src/connection-manager.ts`:
- Around line 37-38: Update the inline comment for the removed option to state
that "oauthHttpAllowed" is deprecated rather than removed: replace the current
comment string about not being supported with a concise deprecation note such as
"// \"oauthHttpAllowed\" is deprecated in the Snowflake SDK (for testing only;
use oauthRedirectUri instead)", keeping the identifier oauthHttpAllowed in the
union definition unchanged so the public API omission remains correct.