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feat(api): read a projection as of an instant, not only a changeset id - #272
Callers usually know when something happened, not which changeset id was current then, so pinning a projection required walking the changeset log by hand first.
Changeset ids are UUIDv7, so the instant can be resolved against the log itself without a second time index that could drift from it.
The response now returns the resolved changeset id, so a time-based read can be repeated exactly and compared with later reads.
Default chosen for review: precision is milliseconds and the boundary is inclusive, matching what a UUIDv7 id can encode; changesets minted in the same millisecond as the instant are included.
Default chosen for review: an instant in the future is refused rather than read as "now", because the answer would silently change as time passes.
Default chosen for review: an instant older than every changeset the caller can read is FAILED_PRECONDITION rather than an empty board, since history before the log is unknown, not empty.
Default chosen for review: only changesets the caller can read are candidates, so another tenant's activity neither resolves the instant nor reveals that it exists.
Default chosen for review: as-of reads remain baseline only and refuse a branch header, because branch history has no rewind path yet.
An older server would ignore as_of_time and return the current model, so a client sends the instant only after the server advertises the feature.
Note
Medium Risk
Adds a new resolution path over the baseline changeset log with tenant visibility and rewind-cap behavior, though it is read-only and gated by a feature flag with integration coverage.
Overview GetEventModelProjection (and the MCP get_event_model_projection tool) can now take an optional as_of_time RFC 3339 instant instead of hunting for a changeset id. The server maps the instant to the newest baseline changeset the caller can read whose UUIDv7 id is at or before that millisecond, then reuses the existing as_of_changeset rewind path. The response adds as_of_changeset so time-based reads can be pinned and repeated by id.
Validation and compatibility match the documented rules: as_of_time and as_of_changeset are mutually exclusive; branch headers are rejected; future instants are INVALID_ARGUMENT; instants before any readable changeset are FAILED_PRECONDITION; unreadable tenants’ changesets are skipped as resolution candidates. Wire contract revision 23 introduces the as_of_time feature flag; clients and MCP only send the field after the server advertises it.
Reviewed by Cursor Bugbot for commit a058306. Bugbot is set up for automated code reviews on this repo. Configure here.
Medium Risk
Adds a new historical read path that resolves time via log walks and visibility rules; mistakes could return wrong board state or leak existence, though behavior mirrors existing as-of changeset semantics.
Overview GetEventModelProjection (and the MCP get_event_model_projection tool) can now take as_of_time, an RFC 3339 instant, as an alternative to as_of_changeset. The server walks the baseline changeset log and picks the newest readable changeset whose UUIDv7 id is minted at or before that instant (millisecond precision, inclusive boundary), then builds the same rewound view as an id-based as-of read.
The response adds as_of_changeset so time-based callers get the resolved id (empty on a current read). as_of_time and as_of_changeset are mutually exclusive; both remain baseline-only with no branch header. Future instants are INVALID_ARGUMENT; instants before any readable changeset are FAILED_PRECONDITION, with the same rewind cap as existing as-of reads.
Documentation in changesets.md and proto comments describe resolution rules, tenancy (unreadable changesets are skipped as candidates), and cost.
Reviewed by Cursor Bugbot for commit 0d4fe58. Bugbot is set up for automated code reviews on this repo. Configure here.
Event-model projection requests can now select a readable baseline changeset by RFC 3339 instant. The server resolves the instant at millisecond precision and returns the selected changeset ID. The API advertises support through a feature flag, and the MCP tool checks that capability before sending the request.
Changes
Time-Based Projection
Layer / File(s)
Summary
Projection API and MCP capability proto/trogonatlas/api/eventmodel/v1alpha1/projections.proto, proto/trogonatlas/api/eventmodel/v1alpha1/service.proto, rsworkspace/crates/trogon-atlas-client/src/compat.rs, rsworkspace/crates/trogon-atlas-mcp/src/*, rsworkspace/crates/trogon-atlas-proto/src/lib.rs, docs/explanation/wire-compatibility.md, docs/reference/mcp-tools.md, docs/explanation/changesets.md
The projection API adds the time selector and resolved changeset ID. The server feature flag and client capability mapping expose support. The MCP tool checks support before sending a request with as_of_time. The contract revision changes to 23. Documentation describes the behavior and compatibility.
Timestamp parsing and projection resolution rsworkspace/crates/trogon-atlas-server/src/as_of.rs, rsworkspace/crates/trogon-atlas-server/src/service.rs
The server validates the timestamp, finds a readable baseline changeset at or before it, and uses that ID for the projection and response. Unit tests cover timestamp parsing and UUIDv7 time comparisons.
Projection integration coverage and behavior documentation rsworkspace/crates/trogon-atlas-server/tests/entity_history.rs, rsworkspace/crates/trogon-atlas-server/tests/cross_tenant_reads.rs, rsworkspace/crates/trogon-atlas-server/tests/phase10_ecommerce_fixture.rs, rsworkspace/crates/trogon-atlas-server/tests/two_tenants.rs
Integration tests cover timestamp-selected projections, reported changeset IDs, invalid selector combinations, and existing requests with an empty as_of_time value.
sequenceDiagram
participant Client
participant GetEventModelProjection
participant AsOfTime
participant baseline_changeset_at
participant SnapshotLookup
Client->>GetEventModelProjection: Send request with as_of_time
GetEventModelProjection->>AsOfTime: Parse and validate instant
GetEventModelProjection->>baseline_changeset_at: Resolve readable changeset at or before instant
baseline_changeset_at->>SnapshotLookup: Provide resolved changeset ID
SnapshotLookup-->>GetEventModelProjection: Return historical projection
GetEventModelProjection-->>Client: Return projection and resolved changeset ID
Loading
Possibly related PRs
TrogonStack/atlas#286: Changes historical snapshot and rewind behavior used after this PR resolves an instant to a changeset.
TrogonStack/atlas#298: Changeset protection operations affect historical content reads through the rewind path used by time-based projection.
Suggested reviewers: enilsen16
Merge Risk: Low · previous review 77dd8
The time-based projection tool has an incomplete RPC policy and reference. Updating them is a bounded follow-up; the omission does not currently change required permissions.
Pre-merge checks: 4 · 1
Failed checks: 1 inconclusive
Check name
Status
Explanation
Resolution
Docstring Coverage
Docstring coverage is 16.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta…
Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed checks: 4 passed
Check name
Status
Explanation
Title check
The title describes the new time-based projection read.
Description check
The description explains the time-based read, resolved changeset ID, validation rules, and compatibility check.
Linked Issues check
Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check
Check skipped because no linked issues were found for this pull request.
Full details: Docstring Coverage
Explanation
Docstring coverage is 16.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 6 functions across 9 files. (6 skipped: 5 unsupported, 1 too large.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
Finishing Touches
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A rabbit checks the clock at noon, Then finds the changeset minted soon. The model’s past comes into view, Its resolved ID is returned too. The bunny hops through time—review!
An older server drops GetEventModelProjection.as_of_time and returns the current model. Clients that send the instant require the feature first.
Signed-off-by: Yordis Prieto <yordis.prieto@gmail.com>
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @rsworkspace/crates/trogon-atlas-mcp/src/server.rs:
- Around line 3998-4009: Update the tool policy entry for
get_event_model_projection to include the GetServerInfo RPC invoked by
compat::advertises when as_of_time is non-empty, then regenerate the reference
so the role-map test checks the complete RPC list.
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The role map and the tool reference only check RPCs the policy lists. An as-of instant calls GetServerInfo first, and that call was missing from the list.
Signed-off-by: Yordis Prieto <yordis.prieto@gmail.com>
An instant one millisecond before the model is also before every readable changeset when both puts share a millisecond, and the server answers FAILED_PRECONDITION instead of the model's absence.
Signed-off-by: Yordis Prieto <yordis.prieto@gmail.com>
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Note
Medium Risk
Adds a new resolution path over the baseline changeset log with tenant visibility and rewind-cap behavior, though it is read-only and gated by a feature flag with integration coverage.
Overview
GetEventModelProjection(and the MCPget_event_model_projectiontool) can now take an optionalas_of_timeRFC 3339 instant instead of hunting for a changeset id. The server maps the instant to the newest baseline changeset the caller can read whose UUIDv7 id is at or before that millisecond, then reuses the existingas_of_changesetrewind path. The response addsas_of_changesetso time-based reads can be pinned and repeated by id.Validation and compatibility match the documented rules:
as_of_timeandas_of_changesetare mutually exclusive; branch headers are rejected; future instants areINVALID_ARGUMENT; instants before any readable changeset areFAILED_PRECONDITION; unreadable tenants’ changesets are skipped as resolution candidates. Wire contract revision 23 introduces theas_of_timefeature flag; clients and MCP only send the field after the server advertises it.Reviewed by Cursor Bugbot for commit a058306. Bugbot is set up for automated code reviews on this repo. Configure here.