feat: add solution storage

internal/models/participant.go

@@ -0,0 +1,10 @@
+package models
+
+import "time"
+
+type Solution struct {
+	Id            *int32     `db:"id"`
+    UserId        *int32     `db:"user_id"`
+    ContestId     *int32     `db:"contest_id"`
+	Name          *string    `db:"name"`
+}

internal/models/result.go

@@ -0,0 +1,22 @@
+package models
+
+import "time"
+
+type Result int32
+
+const (
+    NotTested               Result = 0
+    Accepted                Result = 1
+    TimeLimitExceeded       Result = 2
+    MemoryLimitExceeded     Result = 3
+    CompilationError        Result = 4
+    SystemFailDuringTesting Result = 5
+)
+
+func (result Result) Valid() error {
+    switch result {
+    case NotTested, Accepted, TimeLimitExceeded, MemoryLimitExceede, CompilationError, SystemFailDuringTesting:
+        return nil
+    }
+    return lib.ErrBadResult
+}

internal/models/solution.go

@@ -5,7 +5,7 @@ import "time"
 type Solution struct {
 	Id            *int32     `db:"id"`
 	ParticipantId *int32     `db:"participant_id"`
-	ProblemId     *int32     `db:"problem_id"`
+	TaskId        *int32     `db:"task_id"`
 	LanguageId    *int32     `db:"language_id"`
 	SolutionHash  *string    `db:"solution_hash"`
 	Result        *int32     `db:"result"`