Correlations: Add CreateCorrelation HTTP API (#51630)

* Correlations: add migration

* Correlations: Add CreateCorrelation API

* Correlations: Make correlations work with provisioning

* Handle version changes

* Fix lining error

* lint fixes

* rebuild betterer results

* add a UID to each correlation

* Fix lint errors

* add docs

* better wording in API docs

* remove leftover comment

* handle ds updates

* Fix error message typo

* add bad data test

* make correlations a separate table

* skip readonly check when provisioning correlations

* delete stale correlations when datasources are deleted

* restore provisioned readonly ds

* publish deletion event with full data

* generate swagger and HTTP API docs

* apply source datasource permission to create correlation API

* Fix tests & lint errors

* ignore empty deletion events

* fix last lint errors

* fix more lint error

* Only publish deletion event if datasource was actually deleted

* delete DS provisioning deletes correlations, added & fixed tests

* Fix unmarshalling tests

* Fix linting errors

* Fix deltion event tests

* fix small linting error

* fix lint errors

* update betterer

* fix test

* make path singular

* Revert "make path singular"

This reverts commit 420c3d315e.

* add integration tests

* remove unneeded id from correlations table

* update spec

* update leftover references to CorrelationDTO

* fix tests

* cleanup tests

* fix lint error

pkg/services/correlations/models.go

@@ -0,0 +1,66 @@
+package correlations
+
+import (
+	"errors"
+)
+
+var (
+	ErrSourceDataSourceReadOnly           = errors.New("source data source is read only")
+	ErrSourceDataSourceDoesNotExists      = errors.New("source data source does not exist")
+	ErrTargetDataSourceDoesNotExists      = errors.New("target data source does not exist")
+	ErrCorrelationFailedGenerateUniqueUid = errors.New("failed to generate unique correlation UID")
+	ErrCorrelationIdentifierNotSet        = errors.New("source identifier and org id are needed to be able to edit correlations")
+)
+
+// Correlation is the model for correlations definitions
+type Correlation struct {
+	// Unique identifier of the correlation
+	// example: 50xhMlg9k
+	UID string `json:"uid" xorm:"pk 'uid'"`
+	// UID of the data source the correlation originates from
+	// example:d0oxYRg4z
+	SourceUID string `json:"sourceUid" xorm:"pk 'source_uid'"`
+	// UID of the data source the correlation points to
+	// example:PE1C5CBDA0504A6A3
+	TargetUID string `json:"targetUid" xorm:"target_uid"`
+	// Label identifying the correlation
+	// example: My Label
+	Label string `json:"label" xorm:"label"`
+	// Description of the correlation
+	// example: Logs to Traces
+	Description string `json:"description" xorm:"description"`
+}
+
+// CreateCorrelationResponse is the response struct for CreateCorrelationCommand
+// swagger:model
+type CreateCorrelationResponse struct {
+	Result Correlation `json:"result"`
+	// example: Correlation created
+	Message string `json:"message"`
+}
+
+// CreateCorrelationCommand is the command for creating a correlation
+// swagger:model
+type CreateCorrelationCommand struct {
+	// UID of the data source for which correlation is created.
+	SourceUID         string `json:"-"`
+	OrgId             int64  `json:"-"`
+	SkipReadOnlyCheck bool   `json:"-"`
+	// Target data source UID to which the correlation is created
+	// example:PE1C5CBDA0504A6A3
+	TargetUID string `json:"targetUid" binding:"Required"`
+	// Optional label identifying the correlation
+	// example: My label
+	Label string `json:"label"`
+	// Optional description of the correlation
+	// example: Logs to Traces
+	Description string `json:"description"`
+}
+
+type DeleteCorrelationsBySourceUIDCommand struct {
+	SourceUID string
+}
+
+type DeleteCorrelationsByTargetUIDCommand struct {
+	TargetUID string
+}