Add event changes API endpoint description

lib/www/server/spec/openapi.yaml

@@ -180,6 +180,16 @@ components:
             required: true
             example: 14707
 
+        Since:
+            description: Starting epoch
+            name: since
+            in: path
+            schema:
+                type: string
+                format: date-time
+            required: true
+            example: 1970-01-01T00:00:00Z
+
         QueryLimit:
             description: Maximum number of results to return
             name: limit
@@ -206,6 +216,16 @@ components:
                 pattern: "(([^\\s,;:]+)(\\s*[,;:\\s]\\s*)?)+"
             example: "line,point,tstamp"
 
+        Unique:
+            description: |
+                Return unique results. Any value at all represents `true`.
+            name: unique
+            in: query
+            schema:
+                type: string
+                pattern: ".+"
+            example: "t"
+
 
     schemas:
         Duration:
@@ -602,14 +622,26 @@ components:
                                 Flag to indicate that this event is read-only. It cannot be edited by the user or deleted. Typically this concerns system-generated events such as QC results or midnight shots.
                     additionalProperties: true
 
+        EventIDAbstract:
+            type: object
+            properties:
+                id:
+                    type: number
+                    description: Event ID.
+
+
+        EventUIDAbstract:
+            type: object
+            properties:
+                uid:
+                    type: number
+                    description: Event instance unique ID. When an event is modified, the new entry acquires a different `uid` while keeping the same `id` as the original event.
+
+
         EventAbstract:
             allOf:
                 -
-                    type: object
-                    properties:
-                        id:
-                            type: number
-                            description: Event ID.
+                    $ref: "#/components/schemas/EventIDAbstract"
                 -
                     $ref: "#/components/schemas/EventNew"
 
@@ -659,6 +691,47 @@ components:
                                 * The third element is either an ISO-8601 timestamp or `null`. The latter indicates +∞. These are the events returned by endpoints that do not concern themselves with event history.
                                 * The fourth element is one of `]` or `)`. As before, it indicates either an open or closed interval.
 
+        EventChangesIsDeletedAbstract:
+            type: object
+            properties:
+                is_deleted:
+                    type: boolean
+                    description: >
+                        Flag to indicate whether this event or event instance (depending on the presence of a `uid` attribute) has been deleted.
+
+
+        EventChangesModified:
+            description: An event modification.
+            allOf:
+                -
+                    $ref: "#/components/schemas/EventAbstract"
+                -
+                    $ref: "#/components/schemas/EventChangesIsDeletedAbstract"
+
+        EventChangesDeleted:
+            description: |
+                Identification of a deleted event or event instance.
+
+                **Note:** the details of the deleted event are not included, only its `id` and `uid`.
+            allOf:
+                -
+                    $ref: "#/components/schemas/EventIDAbstract"
+                -
+                    $ref: "#/components/schemas/EventUIDAbstract"
+                -
+                    $ref: "#/components/schemas/EventChangesIsDeletedAbstract"
+
+        EventChanges:
+            description: List of event changes since the given epoch.
+            type: array
+            items:
+                anyOf:
+                    -
+                        $ref: "#/components/schemas/EventChangesDeleted"
+                    -
+                        $ref: "#/components/schemas/EventChangesModified"
+
+
         SeisExportEntryFSP:
             type: object
             properties:
@@ -1382,6 +1455,31 @@ paths:
                     $ref: "#/components/responses/401"
 
 
+    /project/{project}/changes/{since}:
+        get:
+            summary: Get event change history since epoch.
+            tags: [ "log" ]
+            security:
+                - BearerAuthGuest: []
+                - CookieAuthGuest: []
+            parameters:
+                - $ref: "#/components/parameters/Project"
+                - $ref: "#/components/parameters/Since"
+                - $ref: "#/components/parameters/Unique"
+            responses:
+                "200":
+                    description: List of project event changes. If `unique` is given, only the latest version of each event will be returned, otherwise the entire modification history is given, potentially including the same event `id` multiple times.
+                    content:
+                        application/json:
+                            schema:
+                                type: array
+                                items:
+                                    $ref: "#/components/schemas/EventChanges"
+
+                "401":
+                    $ref: "#/components/responses/401"
+
+
     /project/{project}/label:
         get:
             summary: Get project labels.