more information to icebox table

[insipx]

Add more information to the icebox by migrating to a group-scoped schema with multi-dependency support and updating query/insert APIs in xmtp_db and xmtp_proto

Replace single in-row dependency with icebox_dependencies, require group_id on icebox, and add QueryIcebox for inserting and querying dependants; apply destructive migrations and update types and schema bindings.

📍Where to Start

Start with the QueryIcebox trait and its DbConnection implementation in icebox.rs, then review the schema changes in the migrations in up.sql and down.sql.

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Macroscope summarized f3f9562.

[insipx]

This PR is part of a stack of 12 bookmarks:

1. trunk()
2. insipx/causal-fix
3. insipx/icebox-global-cursor ← this PR
4. insipx/batch-queries
5. insipx/extractors
6. insipx/cursor-store-icebox
7. insipx/icebox-in-ordering
8. insipx/test-ordering
9. insipx/paged-stream
10. insipx/ordered-stream
11. insipx/ordered-stream-test
12. push-pnvnmqsyqqqy
13. push-syomxrnuqsnk

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Created with jj-stack

[claude]

Claude finished @insipx's task —— View job

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PR Review - December 10, 2025 21:27 UTC

I've reviewed this PR focusing on areas not already covered by other reviewers. Here are my findings:

🔴 Critical Issues

1. Empty Input Handling (xmtp_db/src/encrypted_store/icebox.rs:270-285)

The ice() method will panic with Diesel when called with an empty orphans vector. Diesel's insert_into().values() fails when passed an empty collection.

fn ice(&self, orphans: Vec<OrphanedEnvelope>) -> Result<usize, crate::ConnectionError> {
    self.raw_query_write(|conn| {
        let dependencies = orphans.iter().flat_map(|o| o.deps()).collect::<Vec<_>>();
        // Will fail if orphans is empty
        let envelopes = diesel::insert_into(dsl::icebox)
            .values(orphans.into_iter().map(Icebox::from).collect::<Vec<_>>())
            .execute(conn)?;

Recommendation: Add early return when orphans.is_empty().

⚠️ Security & Safety Concerns

2. Unsafe Pointer Dereferencing (xmtp_db/src/encrypted_store/icebox/types.rs:13-31)

While the author's justification in review comments is reasonable, the *const [u8] approach is fragile and relies on Diesel implementation details. The code is technically safe within load_iter lifetime, but:

• Zero documentation in code about safety invariants
• Future Diesel changes could break this assumption
• Easy to misuse if code is refactored

Recommendation: Add comprehensive safety documentation directly in the code explaining the lifetime guarantees.

3. SQL Injection Risk Assessment

The SQL queries use parameterized queries ($1, $2), which is correct. No SQL injection risk detected.

🟡 Design & Performance Issues

4. Missing Test Coverage (xmtp_db/src/encrypted_store/icebox.rs:388+)

As noted by tylerhawkes, tests don't verify that queries return the correct subset of rows. Current tests would pass if queries returned all rows. Specifically:

• No test verifies past_dependants(40, 1) returns correct results
• No test verifies query ordering matches expectations
• No test for empty icebox scenarios

5. Index Ordering Already Addressed

Primary key and index ordering concerns (originator before sequence) have been identified by reviewers and acknowledged by the author.

6. Missing ORDER BY Clause (xmtp_db/src/encrypted_store/icebox.rs:265)

The future_dependants query lacks an ORDER BY clause, making results non-deterministic. The past_dependants query has ORDER BY on line 222, but future_dependants doesn't. This inconsistency could cause flaky behavior.

📋 Code Quality

7. Type Safety Opportunity (xmtp_proto/src/types/global_cursor.rs:262-267)

The Extend<super::Cursor> implementation could be more generic using impl<T: Into<Cursor>> as suggested by tylerhawkes (acknowledged as working in subsequent PR).

8. Missing Documentation

• IceboxWithDep struct (types.rs:7-20) lacks doc comments explaining its purpose and safety requirements
• IceboxOrphans trait (types.rs:35-37) has no documentation
• Complex recursive CTEs in SQL lack inline comments explaining the recursion logic

✅ Positives

• Migration strategy is sound (clear up/down migrations)
• Composite primary keys properly defined
• Foreign key constraints appropriately used
• Test coverage exists for basic scenarios
• Follows project conventions (uses #[xmtp_common::test])

📊 Summary

Must Fix Before Merge:

1. Empty input handling in ice() method
2. Add missing test coverage for edge cases
3. Add ORDER BY to future_dependants query

Recommended Improvements:
4. Document safety invariants for IceboxWithDep unsafe code
5. Add doc comments for public types and complex logic

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Review Date: 2025-12-10 21:27 UTC
Patch Coverage: 90.39% (34 lines missing coverage per Codecov)

---

[codecov]

Codecov Report

❌ Patch coverage is 90.39548% with 34 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.94%. Comparing base (08ec6fd) to head (f3f9562).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
xmtp_db/src/encrypted_store/icebox.rs	94.09%	18 Missing ⚠️
xmtp_proto/src/types/cursor.rs	0.00%	9 Missing ⚠️
xmtp_proto/src/types/global_cursor.rs	40.00%	6 Missing ⚠️
xmtp_db/src/encrypted_store/icebox/types.rs	96.55%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2857      +/-   ##
==========================================
+ Coverage   73.88%   73.94%   +0.06%     
==========================================
  Files         397      398       +1     
  Lines       50634    50905     +271     
==========================================
+ Hits        37410    37644     +234     
- Misses      13224    13261      +37     

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[tylerhawkes]

I would like to see a test where past/future dependents is queried for sequence 40 and returns the proper values as well. These tests could pass by just returning all the rows.

[insipx]

new test

[tylerhawkes]

Can these be impl<T: Into<Cursor>> Extend<T> for GlobalCursor ...

[insipx]

worked: 525a0d7