add filtering and base repository

local/model/stateHistory.go

@@ -0,0 +1,59 @@
+package model
+
+import (
+	"time"
+
+	"gorm.io/gorm"
+)
+
+// StateHistoryFilter combines common filter capabilities
+type StateHistoryFilter struct {
+	BaseFilter      // Adds pagination and sorting
+	ServerBasedFilter // Adds server ID from path parameter
+	DateRangeFilter   // Adds date range filtering
+	
+	// Additional fields specific to state history
+	Session     string `query:"session"`
+	MinPlayers  *int   `query:"min_players"`
+	MaxPlayers  *int   `query:"max_players"`
+}
+
+// ApplyFilter implements the Filterable interface
+func (f *StateHistoryFilter) ApplyFilter(query *gorm.DB) *gorm.DB {
+	// Apply server filter
+	if f.ServerID != 0 {
+		query = query.Where("server_id = ?", f.ServerID)
+	}
+
+	// Apply date range filter if set
+	timeZero := time.Time{}
+	if f.StartDate != timeZero {
+		query = query.Where("date_created >= ?", f.StartDate)
+	}
+	if f.EndDate != timeZero {
+		query = query.Where("date_created <= ?", f.EndDate)
+	}
+
+	// Apply session filter if set
+	if f.Session != "" {
+		query = query.Where("session = ?", f.Session)
+	}
+
+	// Apply player count filters if set
+	if f.MinPlayers != nil {
+		query = query.Where("player_count >= ?", *f.MinPlayers)
+	}
+	if f.MaxPlayers != nil {
+		query = query.Where("player_count <= ?", *f.MaxPlayers)
+	}
+
+	return query
+}
+
+type StateHistory struct {
+	ID          uint      `gorm:"primaryKey" json:"id"`
+	ServerID    uint      `json:"serverId" gorm:"not null"`
+	Session     string    `json:"session"`
+	PlayerCount int       `json:"playerCount"`
+	DateCreated time.Time `json:"dateCreated"`
+}