feat(eventstore): increase parallel write capabilities (#5940)

This implementation increases parallel write capabilities of the eventstore.
Please have a look at the technical advisories: [05](https://zitadel.com/docs/support/advisory/a10005) and  [06](https://zitadel.com/docs/support/advisory/a10006).
The implementation of eventstore.push is rewritten and stored events are migrated to a new table `eventstore.events2`.
If you are using cockroach: make sure that the database user of ZITADEL has `VIEWACTIVITY` grant. This is used to query events.

internal/query/current_state_test.go

@@ -0,0 +1,181 @@
+package query
+
+import (
+	"database/sql"
+	"database/sql/driver"
+	"errors"
+	"fmt"
+	"regexp"
+	"testing"
+)
+
+var (
+	currentSequenceStmt = `SELECT` +
+		` projections.current_states.last_updated,` +
+		` projections.current_states.event_date,` +
+		` projections.current_states.position,` +
+		` projections.current_states.projection_name,` +
+		` projections.current_states.aggregate_type,` +
+		` projections.current_states.aggregate_id,` +
+		` projections.current_states.sequence,` +
+		` COUNT(*) OVER ()` +
+		` FROM projections.current_states` +
+		" AS OF SYSTEM TIME '-1 ms' "
+
+	currentSequenceCols = []string{
+		"last_updated",
+		"event_date",
+		"position",
+		"projection_name",
+		"aggregate_type",
+		"aggregate_id",
+		"event_sequence",
+		"count",
+	}
+)
+
+func Test_CurrentSequencesPrepares(t *testing.T) {
+	type want struct {
+		sqlExpectations sqlExpectation
+		err             checkErr
+	}
+	tests := []struct {
+		name    string
+		prepare interface{}
+		want    want
+		object  interface{}
+	}{
+		{
+			name:    "prepareCurrentSequencesQuery no result",
+			prepare: prepareCurrentStateQuery,
+			want: want{
+				sqlExpectations: mockQueries(
+					regexp.QuoteMeta(currentSequenceStmt),
+					nil,
+					nil,
+				),
+			},
+			object: &CurrentStates{CurrentStates: []*CurrentState{}},
+		},
+		{
+			name:    "prepareCurrentSequencesQuery one result",
+			prepare: prepareCurrentStateQuery,
+			want: want{
+				sqlExpectations: mockQueries(
+					regexp.QuoteMeta(currentSequenceStmt),
+					currentSequenceCols,
+					[][]driver.Value{
+						{
+							testNow,
+							testNow,
+							float64(20211108),
+							"projection-name",
+							"agg-type",
+							"agg-id",
+							uint64(20211108),
+						},
+					},
+				),
+			},
+			object: &CurrentStates{
+				SearchResponse: SearchResponse{
+					Count: 1,
+				},
+				CurrentStates: []*CurrentState{
+					{
+						ProjectionName: "projection-name",
+						State: State{
+							EventCreatedAt: testNow,
+							LastRun:        testNow,
+							Position:       20211108,
+							AggregateID:    "agg-id",
+							AggregateType:  "agg-type",
+							Sequence:       20211108,
+						},
+					},
+				},
+			},
+		},
+		{
+			name:    "prepareCurrentSequencesQuery multiple result",
+			prepare: prepareCurrentStateQuery,
+			want: want{
+				sqlExpectations: mockQueries(
+					regexp.QuoteMeta(currentSequenceStmt),
+					currentSequenceCols,
+					[][]driver.Value{
+						{
+							testNow,
+							testNow,
+							float64(20211108),
+							"projection-name",
+							"agg-type",
+							"agg-id",
+							uint64(20211108),
+						},
+						{
+							testNow,
+							testNow,
+							float64(20211108),
+							"projection-name2",
+							"agg-type",
+							"agg-id",
+							uint64(20211108),
+						},
+					},
+				),
+			},
+			object: &CurrentStates{
+				SearchResponse: SearchResponse{
+					Count: 2,
+				},
+				CurrentStates: []*CurrentState{
+					{
+						ProjectionName: "projection-name",
+						State: State{
+							EventCreatedAt: testNow,
+							Position:       20211108,
+							LastRun:        testNow,
+							AggregateID:    "agg-id",
+							AggregateType:  "agg-type",
+							Sequence:       20211108,
+						},
+					},
+					{
+						ProjectionName: "projection-name2",
+						State: State{
+							EventCreatedAt: testNow,
+							Position:       20211108,
+							LastRun:        testNow,
+							AggregateID:    "agg-id",
+							AggregateType:  "agg-type",
+							Sequence:       20211108,
+						},
+					},
+				},
+			},
+		},
+		{
+			name:    "prepareCurrentSequencesQuery sql err",
+			prepare: prepareCurrentStateQuery,
+			want: want{
+				sqlExpectations: mockQueryErr(
+					regexp.QuoteMeta(currentSequenceStmt),
+					sql.ErrConnDone,
+				),
+				err: func(err error) (error, bool) {
+					if !errors.Is(err, sql.ErrConnDone) {
+						return fmt.Errorf("err should be sql.ErrConnDone got: %w", err), false
+					}
+					return nil, true
+				},
+			},
+			object: (*CurrentStates)(nil),
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			assertPrepare(t, tt.prepare, tt.object, tt.want.sqlExpectations, tt.want.err, defaultPrepareArgs...)
+		})
+	}
+}