refactor: implement database-specific schema architecture with schema-as-query pattern

🏗️ **Major Database Schema Refactoring**

**Problem Solved**: Eliminated model duplication and multiple sources of truth by:
- Removed duplicate models (`internal/models/content.go`)
- Replaced inlined schema strings with sqlc-generated setup functions
- Implemented database-specific schemas with proper NOT NULL constraints

**Key Improvements**:
✅ **Single Source of Truth**: Database schemas define all types, no manual sync needed
✅ **Clean Generated Types**: sqlc generates `string` and `int64` instead of `sql.NullString/sql.NullTime`
✅ **Schema-as-Query Pattern**: Setup functions generated by sqlc for type safety
✅ **Database-Specific Optimization**: SQLite INTEGER timestamps, PostgreSQL BIGINT timestamps
✅ **Cross-Database Compatibility**: Single codebase supports both SQLite and PostgreSQL

**Architecture Changes**:
- `db/sqlite/` - SQLite-specific schema and setup queries
- `db/postgresql/` - PostgreSQL-specific schema and setup queries
- `db/queries/` - Cross-database CRUD queries using `sqlc.arg()` syntax
- `internal/db/database.go` - Database abstraction with runtime selection
- `internal/api/models.go` - Clean API models for requests/responses

**Version Control System**: Complete element-level history with user attribution and rollback

**Verification**: ✅ Full API workflow tested (create → update → rollback → versions)
**Production Ready**: Supports SQLite (development) → PostgreSQL (production) migration

insertr-server/internal/api/handlers.go

@@ -1,27 +1,34 @@
 package api
 
 import (
+	"context"
+	"database/sql"
 	"encoding/json"
 	"fmt"
 	"net/http"
+	"strconv"
 	"strings"
+	"time"
 
 	"github.com/gorilla/mux"
 	"github.com/insertr/server/internal/db"
-	"github.com/insertr/server/internal/models"
+	"github.com/insertr/server/internal/db/postgresql"
+	"github.com/insertr/server/internal/db/sqlite"
 )
 
 // ContentHandler handles all content-related HTTP requests
 type ContentHandler struct {
-	db *db.SQLiteDB
+	database *db.Database
 }
 
 // NewContentHandler creates a new content handler
-func NewContentHandler(database *db.SQLiteDB) *ContentHandler {
-	return &ContentHandler{db: database}
+func NewContentHandler(database *db.Database) *ContentHandler {
+	return &ContentHandler{
+		database: database,
+	}
 }
 
-// GetContent handles GET /api/content/{id}?site_id={site}
+// GetContent handles GET /api/content/{id}
 func (h *ContentHandler) GetContent(w http.ResponseWriter, r *http.Request) {
 	vars := mux.Vars(r)
 	contentID := vars["id"]
@@ -32,78 +39,119 @@ func (h *ContentHandler) GetContent(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if contentID == "" {
-		http.Error(w, "content ID is required", http.StatusBadRequest)
+	var content interface{}
+	var err error
+
+	switch h.database.GetDBType() {
+	case "sqlite3":
+		content, err = h.database.GetSQLiteQueries().GetContent(context.Background(), sqlite.GetContentParams{
+			ID:     contentID,
+			SiteID: siteID,
+		})
+	case "postgresql":
+		content, err = h.database.GetPostgreSQLQueries().GetContent(context.Background(), postgresql.GetContentParams{
+			ID:     contentID,
+			SiteID: siteID,
+		})
+	default:
+		http.Error(w, "Unsupported database type", http.StatusInternalServerError)
 		return
 	}
 
-	content, err := h.db.GetContent(siteID, contentID)
 	if err != nil {
+		if err == sql.ErrNoRows {
+			http.Error(w, "Content not found", http.StatusNotFound)
+			return
+		}
 		http.Error(w, fmt.Sprintf("Database error: %v", err), http.StatusInternalServerError)
 		return
 	}
 
-	if content == nil {
-		http.NotFound(w, r)
-		return
-	}
+	item := h.convertToAPIContent(content)
 
 	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(content)
+	json.NewEncoder(w).Encode(item)
 }
 
-// GetAllContent handles GET /api/content?site_id={site}
+// GetAllContent handles GET /api/content
 func (h *ContentHandler) GetAllContent(w http.ResponseWriter, r *http.Request) {
 	siteID := r.URL.Query().Get("site_id")
-
 	if siteID == "" {
 		http.Error(w, "site_id parameter is required", http.StatusBadRequest)
 		return
 	}
 
-	items, err := h.db.GetAllContent(siteID)
+	var dbContent interface{}
+	var err error
+
+	switch h.database.GetDBType() {
+	case "sqlite3":
+		dbContent, err = h.database.GetSQLiteQueries().GetAllContent(context.Background(), siteID)
+	case "postgresql":
+		dbContent, err = h.database.GetPostgreSQLQueries().GetAllContent(context.Background(), siteID)
+	default:
+		http.Error(w, "Unsupported database type", http.StatusInternalServerError)
+		return
+	}
+
 	if err != nil {
 		http.Error(w, fmt.Sprintf("Database error: %v", err), http.StatusInternalServerError)
 		return
 	}
 
-	response := models.ContentResponse{
-		Content: items,
-	}
+	items := h.convertToAPIContentList(dbContent)
+	response := ContentResponse{Content: items}
 
 	w.Header().Set("Content-Type", "application/json")
 	json.NewEncoder(w).Encode(response)
 }
 
-// GetBulkContent handles GET /api/content/bulk?site_id={site}&ids[]={id1}&ids[]={id2}
+// GetBulkContent handles GET /api/content/bulk
 func (h *ContentHandler) GetBulkContent(w http.ResponseWriter, r *http.Request) {
 	siteID := r.URL.Query().Get("site_id")
-	contentIDs := r.URL.Query()["ids"]
-
 	if siteID == "" {
 		http.Error(w, "site_id parameter is required", http.StatusBadRequest)
 		return
 	}
 
-	if len(contentIDs) == 0 {
-		// Return empty response if no IDs provided
-		response := models.ContentResponse{
-			Content: []models.ContentItem{},
+	// Parse ids parameter
+	idsParam := r.URL.Query()["ids[]"]
+	if len(idsParam) == 0 {
+		// Try single ids parameter
+		idsStr := r.URL.Query().Get("ids")
+		if idsStr == "" {
+			http.Error(w, "ids parameter is required", http.StatusBadRequest)
+			return
 		}
-		w.Header().Set("Content-Type", "application/json")
-		json.NewEncoder(w).Encode(response)
+		idsParam = strings.Split(idsStr, ",")
+	}
+
+	var dbContent interface{}
+	var err error
+
+	switch h.database.GetDBType() {
+	case "sqlite3":
+		dbContent, err = h.database.GetSQLiteQueries().GetBulkContent(context.Background(), sqlite.GetBulkContentParams{
+			SiteID: siteID,
+			Ids:    idsParam,
+		})
+	case "postgresql":
+		dbContent, err = h.database.GetPostgreSQLQueries().GetBulkContent(context.Background(), postgresql.GetBulkContentParams{
+			SiteID: siteID,
+			Ids:    idsParam,
+		})
+	default:
+		http.Error(w, "Unsupported database type", http.StatusInternalServerError)
 		return
 	}
 
-	items, err := h.db.GetBulkContent(siteID, contentIDs)
 	if err != nil {
 		http.Error(w, fmt.Sprintf("Database error: %v", err), http.StatusInternalServerError)
 		return
 	}
 
-	response := models.ContentResponse{
-		Content: items,
-	}
+	items := h.convertToAPIContentList(dbContent)
+	response := ContentResponse{Content: items}
 
 	w.Header().Set("Content-Type", "application/json")
 	json.NewEncoder(w).Encode(response)
@@ -111,55 +159,64 @@ func (h *ContentHandler) GetBulkContent(w http.ResponseWriter, r *http.Request)
 
 // CreateContent handles POST /api/content
 func (h *ContentHandler) CreateContent(w http.ResponseWriter, r *http.Request) {
+	var req CreateContentRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		http.Error(w, "Invalid JSON", http.StatusBadRequest)
+		return
+	}
+
 	siteID := r.URL.Query().Get("site_id")
 	if siteID == "" {
-		siteID = "demo" // Default to demo site for compatibility
+		siteID = req.SiteID // fallback to request body
+	}
+	if siteID == "" {
+		siteID = "default" // final fallback
 	}
 
-	var req models.CreateContentRequest
-	decoder := json.NewDecoder(r.Body)
-	if err := decoder.Decode(&req); err != nil {
-		http.Error(w, fmt.Sprintf("Invalid JSON: %v", err), http.StatusBadRequest)
+	// Extract user from request (for now, use X-User-ID header or fallback)
+	userID := r.Header.Get("X-User-ID")
+	if userID == "" && req.CreatedBy != "" {
+		userID = req.CreatedBy
+	}
+	if userID == "" {
+		userID = "anonymous"
+	}
+
+	var content interface{}
+	var err error
+
+	switch h.database.GetDBType() {
+	case "sqlite3":
+		content, err = h.database.GetSQLiteQueries().CreateContent(context.Background(), sqlite.CreateContentParams{
+			ID:           req.ID,
+			SiteID:       siteID,
+			Value:        req.Value,
+			Type:         req.Type,
+			LastEditedBy: userID,
+		})
+	case "postgresql":
+		content, err = h.database.GetPostgreSQLQueries().CreateContent(context.Background(), postgresql.CreateContentParams{
+			ID:           req.ID,
+			SiteID:       siteID,
+			Value:        req.Value,
+			Type:         req.Type,
+			LastEditedBy: userID,
+		})
+	default:
+		http.Error(w, "Unsupported database type", http.StatusInternalServerError)
 		return
 	}
 
-	// Validate content type
-	validTypes := []string{"text", "markdown", "link"}
-	isValidType := false
-	for _, validType := range validTypes {
-		if req.Type == validType {
-			isValidType = true
-			break
-		}
-	}
-
-	if !isValidType {
-		http.Error(w, fmt.Sprintf("Invalid content type. Must be one of: %s", strings.Join(validTypes, ", ")), http.StatusBadRequest)
-		return
-	}
-
-	// Check if content already exists
-	existing, err := h.db.GetContent(siteID, req.ID)
 	if err != nil {
-		http.Error(w, fmt.Sprintf("Database error: %v", err), http.StatusInternalServerError)
+		http.Error(w, fmt.Sprintf("Failed to create content: %v", err), http.StatusInternalServerError)
 		return
 	}
 
-	if existing != nil {
-		http.Error(w, "Content with this ID already exists", http.StatusConflict)
-		return
-	}
-
-	// Create content
-	content, err := h.db.CreateContent(siteID, req.ID, req.Value, req.Type)
-	if err != nil {
-		http.Error(w, fmt.Sprintf("Database error: %v", err), http.StatusInternalServerError)
-		return
-	}
+	item := h.convertToAPIContent(content)
 
 	w.Header().Set("Content-Type", "application/json")
 	w.WriteHeader(http.StatusCreated)
-	json.NewEncoder(w).Encode(content)
+	json.NewEncoder(w).Encode(item)
 }
 
 // UpdateContent handles PUT /api/content/{id}
@@ -169,32 +226,443 @@ func (h *ContentHandler) UpdateContent(w http.ResponseWriter, r *http.Request) {
 	siteID := r.URL.Query().Get("site_id")
 
 	if siteID == "" {
-		siteID = "demo" // Default to demo site for compatibility
-	}
-
-	if contentID == "" {
-		http.Error(w, "content ID is required", http.StatusBadRequest)
+		http.Error(w, "site_id parameter is required", http.StatusBadRequest)
 		return
 	}
 
-	var req models.UpdateContentRequest
-	decoder := json.NewDecoder(r.Body)
-	if err := decoder.Decode(&req); err != nil {
-		http.Error(w, fmt.Sprintf("Invalid JSON: %v", err), http.StatusBadRequest)
+	var req UpdateContentRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		http.Error(w, "Invalid JSON", http.StatusBadRequest)
+		return
+	}
+
+	// Extract user from request
+	userID := r.Header.Get("X-User-ID")
+	if userID == "" && req.UpdatedBy != "" {
+		userID = req.UpdatedBy
+	}
+	if userID == "" {
+		userID = "anonymous"
+	}
+
+	// Get current content for version history and type preservation
+	var currentContent interface{}
+	var err error
+
+	switch h.database.GetDBType() {
+	case "sqlite3":
+		currentContent, err = h.database.GetSQLiteQueries().GetContent(context.Background(), sqlite.GetContentParams{
+			ID:     contentID,
+			SiteID: siteID,
+		})
+	case "postgresql":
+		currentContent, err = h.database.GetPostgreSQLQueries().GetContent(context.Background(), postgresql.GetContentParams{
+			ID:     contentID,
+			SiteID: siteID,
+		})
+	default:
+		http.Error(w, "Unsupported database type", http.StatusInternalServerError)
 		return
 	}
 
-	// Update content
-	content, err := h.db.UpdateContent(siteID, contentID, req.Value)
 	if err != nil {
-		if strings.Contains(err.Error(), "not found") {
-			http.NotFound(w, r)
+		if err == sql.ErrNoRows {
+			http.Error(w, "Content not found", http.StatusNotFound)
 			return
 		}
 		http.Error(w, fmt.Sprintf("Database error: %v", err), http.StatusInternalServerError)
 		return
 	}
 
+	// Archive current version before updating
+	err = h.createContentVersion(currentContent)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Failed to create version: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	// Determine content type
+	contentType := req.Type
+	if contentType == "" {
+		contentType = h.getContentType(currentContent) // preserve existing type if not specified
+	}
+
+	// Update the content
+	var updatedContent interface{}
+
+	switch h.database.GetDBType() {
+	case "sqlite3":
+		updatedContent, err = h.database.GetSQLiteQueries().UpdateContent(context.Background(), sqlite.UpdateContentParams{
+			Value:        req.Value,
+			Type:         contentType,
+			LastEditedBy: userID,
+			ID:           contentID,
+			SiteID:       siteID,
+		})
+	case "postgresql":
+		updatedContent, err = h.database.GetPostgreSQLQueries().UpdateContent(context.Background(), postgresql.UpdateContentParams{
+			Value:        req.Value,
+			Type:         contentType,
+			LastEditedBy: userID,
+			ID:           contentID,
+			SiteID:       siteID,
+		})
+	default:
+		http.Error(w, "Unsupported database type", http.StatusInternalServerError)
+		return
+	}
+
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Failed to update content: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	item := h.convertToAPIContent(updatedContent)
+
 	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(content)
+	json.NewEncoder(w).Encode(item)
+}
+
+// DeleteContent handles DELETE /api/content/{id}
+func (h *ContentHandler) DeleteContent(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	contentID := vars["id"]
+	siteID := r.URL.Query().Get("site_id")
+
+	if siteID == "" {
+		http.Error(w, "site_id parameter is required", http.StatusBadRequest)
+		return
+	}
+
+	var err error
+
+	switch h.database.GetDBType() {
+	case "sqlite3":
+		err = h.database.GetSQLiteQueries().DeleteContent(context.Background(), sqlite.DeleteContentParams{
+			ID:     contentID,
+			SiteID: siteID,
+		})
+	case "postgresql":
+		err = h.database.GetPostgreSQLQueries().DeleteContent(context.Background(), postgresql.DeleteContentParams{
+			ID:     contentID,
+			SiteID: siteID,
+		})
+	default:
+		http.Error(w, "Unsupported database type", http.StatusInternalServerError)
+		return
+	}
+
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Failed to delete content: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	w.WriteHeader(http.StatusNoContent)
+}
+
+// GetContentVersions handles GET /api/content/{id}/versions
+func (h *ContentHandler) GetContentVersions(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	contentID := vars["id"]
+	siteID := r.URL.Query().Get("site_id")
+
+	if siteID == "" {
+		http.Error(w, "site_id parameter is required", http.StatusBadRequest)
+		return
+	}
+
+	// Parse limit parameter (default to 10)
+	limit := int64(10)
+	if limitStr := r.URL.Query().Get("limit"); limitStr != "" {
+		if parsedLimit, err := strconv.ParseInt(limitStr, 10, 64); err == nil {
+			limit = parsedLimit
+		}
+	}
+
+	var dbVersions interface{}
+	var err error
+
+	switch h.database.GetDBType() {
+	case "sqlite3":
+		dbVersions, err = h.database.GetSQLiteQueries().GetContentVersionHistory(context.Background(), sqlite.GetContentVersionHistoryParams{
+			ContentID:  contentID,
+			SiteID:     siteID,
+			LimitCount: limit,
+		})
+	case "postgresql":
+		// Note: PostgreSQL uses different parameter names due to int32 vs int64
+		dbVersions, err = h.database.GetPostgreSQLQueries().GetContentVersionHistory(context.Background(), postgresql.GetContentVersionHistoryParams{
+			ContentID:  contentID,
+			SiteID:     siteID,
+			LimitCount: int32(limit),
+		})
+	default:
+		http.Error(w, "Unsupported database type", http.StatusInternalServerError)
+		return
+	}
+
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Database error: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	versions := h.convertToAPIVersionList(dbVersions)
+	response := ContentVersionsResponse{Versions: versions}
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(response)
+}
+
+// RollbackContent handles POST /api/content/{id}/rollback
+func (h *ContentHandler) RollbackContent(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	contentID := vars["id"]
+	siteID := r.URL.Query().Get("site_id")
+
+	if siteID == "" {
+		http.Error(w, "site_id parameter is required", http.StatusBadRequest)
+		return
+	}
+
+	var req RollbackContentRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		http.Error(w, "Invalid JSON", http.StatusBadRequest)
+		return
+	}
+
+	// Get the target version
+	var targetVersion interface{}
+	var err error
+
+	switch h.database.GetDBType() {
+	case "sqlite3":
+		targetVersion, err = h.database.GetSQLiteQueries().GetContentVersion(context.Background(), req.VersionID)
+	case "postgresql":
+		targetVersion, err = h.database.GetPostgreSQLQueries().GetContentVersion(context.Background(), int32(req.VersionID))
+	default:
+		http.Error(w, "Unsupported database type", http.StatusInternalServerError)
+		return
+	}
+
+	if err != nil {
+		if err == sql.ErrNoRows {
+			http.Error(w, "Version not found", http.StatusNotFound)
+			return
+		}
+		http.Error(w, fmt.Sprintf("Database error: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	// Verify the version belongs to the correct content
+	if !h.versionMatches(targetVersion, contentID, siteID) {
+		http.Error(w, "Version does not match content", http.StatusBadRequest)
+		return
+	}
+
+	// Extract user from request
+	userID := r.Header.Get("X-User-ID")
+	if userID == "" && req.RolledBackBy != "" {
+		userID = req.RolledBackBy
+	}
+	if userID == "" {
+		userID = "anonymous"
+	}
+
+	// Archive current version before rollback
+	var currentContent interface{}
+
+	switch h.database.GetDBType() {
+	case "sqlite3":
+		currentContent, err = h.database.GetSQLiteQueries().GetContent(context.Background(), sqlite.GetContentParams{
+			ID:     contentID,
+			SiteID: siteID,
+		})
+	case "postgresql":
+		currentContent, err = h.database.GetPostgreSQLQueries().GetContent(context.Background(), postgresql.GetContentParams{
+			ID:     contentID,
+			SiteID: siteID,
+		})
+	default:
+		http.Error(w, "Unsupported database type", http.StatusInternalServerError)
+		return
+	}
+
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Failed to get current content: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	err = h.createContentVersion(currentContent)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Failed to create version: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	// Rollback to target version
+	var updatedContent interface{}
+
+	switch h.database.GetDBType() {
+	case "sqlite3":
+		sqliteVersion := targetVersion.(sqlite.ContentVersion)
+		updatedContent, err = h.database.GetSQLiteQueries().UpdateContent(context.Background(), sqlite.UpdateContentParams{
+			Value:        sqliteVersion.Value,
+			Type:         sqliteVersion.Type,
+			LastEditedBy: userID,
+			ID:           contentID,
+			SiteID:       siteID,
+		})
+	case "postgresql":
+		pgVersion := targetVersion.(postgresql.ContentVersion)
+		updatedContent, err = h.database.GetPostgreSQLQueries().UpdateContent(context.Background(), postgresql.UpdateContentParams{
+			Value:        pgVersion.Value,
+			Type:         pgVersion.Type,
+			LastEditedBy: userID,
+			ID:           contentID,
+			SiteID:       siteID,
+		})
+	default:
+		http.Error(w, "Unsupported database type", http.StatusInternalServerError)
+		return
+	}
+
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Failed to rollback content: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	item := h.convertToAPIContent(updatedContent)
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(item)
+}
+
+// Helper functions for type conversion
+func (h *ContentHandler) convertToAPIContent(content interface{}) ContentItem {
+	switch h.database.GetDBType() {
+	case "sqlite3":
+		c := content.(sqlite.Content)
+		return ContentItem{
+			ID:           c.ID,
+			SiteID:       c.SiteID,
+			Value:        c.Value,
+			Type:         c.Type,
+			CreatedAt:    time.Unix(c.CreatedAt, 0),
+			UpdatedAt:    time.Unix(c.UpdatedAt, 0),
+			LastEditedBy: c.LastEditedBy,
+		}
+	case "postgresql":
+		c := content.(postgresql.Content)
+		return ContentItem{
+			ID:           c.ID,
+			SiteID:       c.SiteID,
+			Value:        c.Value,
+			Type:         c.Type,
+			CreatedAt:    time.Unix(c.CreatedAt, 0),
+			UpdatedAt:    time.Unix(c.UpdatedAt, 0),
+			LastEditedBy: c.LastEditedBy,
+		}
+	}
+	return ContentItem{} // Should never happen
+}
+
+func (h *ContentHandler) convertToAPIContentList(contentList interface{}) []ContentItem {
+	switch h.database.GetDBType() {
+	case "sqlite3":
+		list := contentList.([]sqlite.Content)
+		items := make([]ContentItem, len(list))
+		for i, content := range list {
+			items[i] = h.convertToAPIContent(content)
+		}
+		return items
+	case "postgresql":
+		list := contentList.([]postgresql.Content)
+		items := make([]ContentItem, len(list))
+		for i, content := range list {
+			items[i] = h.convertToAPIContent(content)
+		}
+		return items
+	}
+	return []ContentItem{} // Should never happen
+}
+
+func (h *ContentHandler) convertToAPIVersionList(versionList interface{}) []ContentVersion {
+	switch h.database.GetDBType() {
+	case "sqlite3":
+		list := versionList.([]sqlite.ContentVersion)
+		versions := make([]ContentVersion, len(list))
+		for i, version := range list {
+			versions[i] = ContentVersion{
+				VersionID: version.VersionID,
+				ContentID: version.ContentID,
+				SiteID:    version.SiteID,
+				Value:     version.Value,
+				Type:      version.Type,
+				CreatedAt: time.Unix(version.CreatedAt, 0),
+				CreatedBy: version.CreatedBy,
+			}
+		}
+		return versions
+	case "postgresql":
+		list := versionList.([]postgresql.ContentVersion)
+		versions := make([]ContentVersion, len(list))
+		for i, version := range list {
+			versions[i] = ContentVersion{
+				VersionID: int64(version.VersionID),
+				ContentID: version.ContentID,
+				SiteID:    version.SiteID,
+				Value:     version.Value,
+				Type:      version.Type,
+				CreatedAt: time.Unix(version.CreatedAt, 0),
+				CreatedBy: version.CreatedBy,
+			}
+		}
+		return versions
+	}
+	return []ContentVersion{} // Should never happen
+}
+
+func (h *ContentHandler) createContentVersion(content interface{}) error {
+	switch h.database.GetDBType() {
+	case "sqlite3":
+		c := content.(sqlite.Content)
+		return h.database.GetSQLiteQueries().CreateContentVersion(context.Background(), sqlite.CreateContentVersionParams{
+			ContentID: c.ID,
+			SiteID:    c.SiteID,
+			Value:     c.Value,
+			Type:      c.Type,
+			CreatedBy: c.LastEditedBy,
+		})
+	case "postgresql":
+		c := content.(postgresql.Content)
+		return h.database.GetPostgreSQLQueries().CreateContentVersion(context.Background(), postgresql.CreateContentVersionParams{
+			ContentID: c.ID,
+			SiteID:    c.SiteID,
+			Value:     c.Value,
+			Type:      c.Type,
+			CreatedBy: c.LastEditedBy,
+		})
+	}
+	return fmt.Errorf("unsupported database type")
+}
+
+func (h *ContentHandler) getContentType(content interface{}) string {
+	switch h.database.GetDBType() {
+	case "sqlite3":
+		return content.(sqlite.Content).Type
+	case "postgresql":
+		return content.(postgresql.Content).Type
+	}
+	return ""
+}
+
+func (h *ContentHandler) versionMatches(version interface{}, contentID, siteID string) bool {
+	switch h.database.GetDBType() {
+	case "sqlite3":
+		v := version.(sqlite.ContentVersion)
+		return v.ContentID == contentID && v.SiteID == siteID
+	case "postgresql":
+		v := version.(postgresql.ContentVersion)
+		return v.ContentID == contentID && v.SiteID == siteID
+	}
+	return false
 }

insertr-server/internal/api/models.go

@@ -0,0 +1,52 @@
+package api
+
+import "time"
+
+// API request/response models
+type ContentItem struct {
+	ID           string    `json:"id"`
+	SiteID       string    `json:"site_id"`
+	Value        string    `json:"value"`
+	Type         string    `json:"type"`
+	CreatedAt    time.Time `json:"created_at"`
+	UpdatedAt    time.Time `json:"updated_at"`
+	LastEditedBy string    `json:"last_edited_by"`
+}
+
+type ContentVersion struct {
+	VersionID int64     `json:"version_id"`
+	ContentID string    `json:"content_id"`
+	SiteID    string    `json:"site_id"`
+	Value     string    `json:"value"`
+	Type      string    `json:"type"`
+	CreatedAt time.Time `json:"created_at"`
+	CreatedBy string    `json:"created_by"`
+}
+
+type ContentResponse struct {
+	Content []ContentItem `json:"content"`
+}
+
+type ContentVersionsResponse struct {
+	Versions []ContentVersion `json:"versions"`
+}
+
+// Request models
+type CreateContentRequest struct {
+	ID        string `json:"id"`
+	SiteID    string `json:"site_id,omitempty"`
+	Value     string `json:"value"`
+	Type      string `json:"type"`
+	CreatedBy string `json:"created_by,omitempty"`
+}
+
+type UpdateContentRequest struct {
+	Value     string `json:"value"`
+	Type      string `json:"type,omitempty"`
+	UpdatedBy string `json:"updated_by,omitempty"`
+}
+
+type RollbackContentRequest struct {
+	VersionID    int64  `json:"version_id"`
+	RolledBackBy string `json:"rolled_back_by,omitempty"`
+}

insertr-server/internal/db/database.go

@@ -0,0 +1,184 @@
+package db
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"strings"
+
+	_ "github.com/lib/pq"
+	_ "github.com/mattn/go-sqlite3"
+
+	"github.com/insertr/server/internal/db/postgresql"
+	"github.com/insertr/server/internal/db/sqlite"
+)
+
+// Database wraps the database connection and queries
+type Database struct {
+	conn   *sql.DB
+	dbType string
+
+	// Type-specific query interfaces
+	sqliteQueries     *sqlite.Queries
+	postgresqlQueries *postgresql.Queries
+}
+
+// NewDatabase creates a new database connection
+func NewDatabase(dbPath string) (*Database, error) {
+	var conn *sql.DB
+	var dbType string
+	var err error
+
+	// Determine database type from connection string
+	if strings.Contains(dbPath, "postgres://") || strings.Contains(dbPath, "postgresql://") {
+		dbType = "postgresql"
+		conn, err = sql.Open("postgres", dbPath)
+	} else {
+		dbType = "sqlite3"
+		conn, err = sql.Open("sqlite3", dbPath)
+	}
+
+	if err != nil {
+		return nil, fmt.Errorf("failed to open database: %w", err)
+	}
+
+	// Test connection
+	if err := conn.Ping(); err != nil {
+		conn.Close()
+		return nil, fmt.Errorf("failed to ping database: %w", err)
+	}
+
+	// Initialize the appropriate queries
+	db := &Database{
+		conn:   conn,
+		dbType: dbType,
+	}
+
+	switch dbType {
+	case "sqlite3":
+		// Initialize SQLite schema using generated functions
+		db.sqliteQueries = sqlite.New(conn)
+		if err := db.initializeSQLiteSchema(); err != nil {
+			conn.Close()
+			return nil, fmt.Errorf("failed to initialize SQLite schema: %w", err)
+		}
+	case "postgresql":
+		// Initialize PostgreSQL schema using generated functions
+		db.postgresqlQueries = postgresql.New(conn)
+		if err := db.initializePostgreSQLSchema(); err != nil {
+			conn.Close()
+			return nil, fmt.Errorf("failed to initialize PostgreSQL schema: %w", err)
+		}
+	default:
+		return nil, fmt.Errorf("unsupported database type: %s", dbType)
+	}
+
+	return db, nil
+}
+
+// Close closes the database connection
+func (db *Database) Close() error {
+	return db.conn.Close()
+}
+
+// GetQueries returns the appropriate query interface
+func (db *Database) GetSQLiteQueries() *sqlite.Queries {
+	return db.sqliteQueries
+}
+
+func (db *Database) GetPostgreSQLQueries() *postgresql.Queries {
+	return db.postgresqlQueries
+}
+
+// GetDBType returns the database type
+func (db *Database) GetDBType() string {
+	return db.dbType
+}
+
+// initializeSQLiteSchema sets up the SQLite database schema
+func (db *Database) initializeSQLiteSchema() error {
+	ctx := context.Background()
+
+	// Create tables
+	if err := db.sqliteQueries.InitializeSchema(ctx); err != nil {
+		return fmt.Errorf("failed to create content table: %w", err)
+	}
+
+	if err := db.sqliteQueries.InitializeVersionsTable(ctx); err != nil {
+		return fmt.Errorf("failed to create content_versions table: %w", err)
+	}
+
+	// Create indexes (manual for now since sqlc didn't generate them)
+	indexQueries := []string{
+		"CREATE INDEX IF NOT EXISTS idx_content_site_id ON content(site_id);",
+		"CREATE INDEX IF NOT EXISTS idx_content_updated_at ON content(updated_at);",
+		"CREATE INDEX IF NOT EXISTS idx_content_versions_lookup ON content_versions(content_id, site_id, created_at DESC);",
+	}
+
+	for _, query := range indexQueries {
+		if _, err := db.conn.Exec(query); err != nil {
+			return fmt.Errorf("failed to create index: %w", err)
+		}
+	}
+
+	// Create update trigger (manual for now)
+	triggerQuery := `
+	CREATE TRIGGER IF NOT EXISTS update_content_updated_at
+	AFTER UPDATE ON content
+	FOR EACH ROW
+	BEGIN
+		UPDATE content SET updated_at = strftime('%s', 'now') WHERE id = NEW.id AND site_id = NEW.site_id;
+	END;`
+
+	if _, err := db.conn.Exec(triggerQuery); err != nil {
+		return fmt.Errorf("failed to create update trigger: %w", err)
+	}
+
+	return nil
+}
+
+// initializePostgreSQLSchema sets up the PostgreSQL database schema
+func (db *Database) initializePostgreSQLSchema() error {
+	ctx := context.Background()
+
+	// Create tables
+	if err := db.postgresqlQueries.InitializeSchema(ctx); err != nil {
+		return fmt.Errorf("failed to create content table: %w", err)
+	}
+
+	if err := db.postgresqlQueries.InitializeVersionsTable(ctx); err != nil {
+		return fmt.Errorf("failed to create content_versions table: %w", err)
+	}
+
+	// Create indexes using generated functions
+	if err := db.postgresqlQueries.CreateContentSiteIndex(ctx); err != nil {
+		return fmt.Errorf("failed to create content site index: %w", err)
+	}
+
+	if err := db.postgresqlQueries.CreateContentUpdatedAtIndex(ctx); err != nil {
+		return fmt.Errorf("failed to create content updated_at index: %w", err)
+	}
+
+	if err := db.postgresqlQueries.CreateVersionsLookupIndex(ctx); err != nil {
+		return fmt.Errorf("failed to create versions lookup index: %w", err)
+	}
+
+	// Create update function and trigger
+	if err := db.postgresqlQueries.CreateUpdateFunction(ctx); err != nil {
+		return fmt.Errorf("failed to create update function: %w", err)
+	}
+
+	// Create trigger manually (sqlc didn't generate this)
+	triggerQuery := `
+		DROP TRIGGER IF EXISTS update_content_updated_at ON content;
+		CREATE TRIGGER update_content_updated_at
+		BEFORE UPDATE ON content
+		FOR EACH ROW
+		EXECUTE FUNCTION update_content_timestamp();`
+
+	if _, err := db.conn.Exec(triggerQuery); err != nil {
+		return fmt.Errorf("failed to create update trigger: %w", err)
+	}
+
+	return nil
+}

insertr-server/internal/db/postgresql/content.sql.go

@@ -0,0 +1,214 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.29.0
+// source: content.sql
+
+package postgresql
+
+import (
+	"context"
+	"strings"
+)
+
+const createContent = `-- name: CreateContent :one
+INSERT INTO content (id, site_id, value, type, last_edited_by)
+VALUES ($1, $2, $3, $4, $5)
+RETURNING id, site_id, value, type, created_at, updated_at, last_edited_by
+`
+
+type CreateContentParams struct {
+	ID           string `json:"id"`
+	SiteID       string `json:"site_id"`
+	Value        string `json:"value"`
+	Type         string `json:"type"`
+	LastEditedBy string `json:"last_edited_by"`
+}
+
+func (q *Queries) CreateContent(ctx context.Context, arg CreateContentParams) (Content, error) {
+	row := q.db.QueryRowContext(ctx, createContent,
+		arg.ID,
+		arg.SiteID,
+		arg.Value,
+		arg.Type,
+		arg.LastEditedBy,
+	)
+	var i Content
+	err := row.Scan(
+		&i.ID,
+		&i.SiteID,
+		&i.Value,
+		&i.Type,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+		&i.LastEditedBy,
+	)
+	return i, err
+}
+
+const deleteContent = `-- name: DeleteContent :exec
+DELETE FROM content 
+WHERE id = $1 AND site_id = $2
+`
+
+type DeleteContentParams struct {
+	ID     string `json:"id"`
+	SiteID string `json:"site_id"`
+}
+
+func (q *Queries) DeleteContent(ctx context.Context, arg DeleteContentParams) error {
+	_, err := q.db.ExecContext(ctx, deleteContent, arg.ID, arg.SiteID)
+	return err
+}
+
+const getAllContent = `-- name: GetAllContent :many
+SELECT id, site_id, value, type, created_at, updated_at, last_edited_by
+FROM content 
+WHERE site_id = $1
+ORDER BY updated_at DESC
+`
+
+func (q *Queries) GetAllContent(ctx context.Context, siteID string) ([]Content, error) {
+	rows, err := q.db.QueryContext(ctx, getAllContent, siteID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []Content
+	for rows.Next() {
+		var i Content
+		if err := rows.Scan(
+			&i.ID,
+			&i.SiteID,
+			&i.Value,
+			&i.Type,
+			&i.CreatedAt,
+			&i.UpdatedAt,
+			&i.LastEditedBy,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Close(); err != nil {
+		return nil, err
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
+const getBulkContent = `-- name: GetBulkContent :many
+SELECT id, site_id, value, type, created_at, updated_at, last_edited_by
+FROM content 
+WHERE site_id = $1 AND id IN ($2)
+`
+
+type GetBulkContentParams struct {
+	SiteID string   `json:"site_id"`
+	Ids    []string `json:"ids"`
+}
+
+func (q *Queries) GetBulkContent(ctx context.Context, arg GetBulkContentParams) ([]Content, error) {
+	query := getBulkContent
+	var queryParams []interface{}
+	queryParams = append(queryParams, arg.SiteID)
+	if len(arg.Ids) > 0 {
+		for _, v := range arg.Ids {
+			queryParams = append(queryParams, v)
+		}
+		query = strings.Replace(query, "/*SLICE:ids*/?", strings.Repeat(",?", len(arg.Ids))[1:], 1)
+	} else {
+		query = strings.Replace(query, "/*SLICE:ids*/?", "NULL", 1)
+	}
+	rows, err := q.db.QueryContext(ctx, query, queryParams...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []Content
+	for rows.Next() {
+		var i Content
+		if err := rows.Scan(
+			&i.ID,
+			&i.SiteID,
+			&i.Value,
+			&i.Type,
+			&i.CreatedAt,
+			&i.UpdatedAt,
+			&i.LastEditedBy,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Close(); err != nil {
+		return nil, err
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
+const getContent = `-- name: GetContent :one
+SELECT id, site_id, value, type, created_at, updated_at, last_edited_by
+FROM content 
+WHERE id = $1 AND site_id = $2
+`
+
+type GetContentParams struct {
+	ID     string `json:"id"`
+	SiteID string `json:"site_id"`
+}
+
+func (q *Queries) GetContent(ctx context.Context, arg GetContentParams) (Content, error) {
+	row := q.db.QueryRowContext(ctx, getContent, arg.ID, arg.SiteID)
+	var i Content
+	err := row.Scan(
+		&i.ID,
+		&i.SiteID,
+		&i.Value,
+		&i.Type,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+		&i.LastEditedBy,
+	)
+	return i, err
+}
+
+const updateContent = `-- name: UpdateContent :one
+UPDATE content 
+SET value = $1, type = $2, last_edited_by = $3
+WHERE id = $4 AND site_id = $5
+RETURNING id, site_id, value, type, created_at, updated_at, last_edited_by
+`
+
+type UpdateContentParams struct {
+	Value        string `json:"value"`
+	Type         string `json:"type"`
+	LastEditedBy string `json:"last_edited_by"`
+	ID           string `json:"id"`
+	SiteID       string `json:"site_id"`
+}
+
+func (q *Queries) UpdateContent(ctx context.Context, arg UpdateContentParams) (Content, error) {
+	row := q.db.QueryRowContext(ctx, updateContent,
+		arg.Value,
+		arg.Type,
+		arg.LastEditedBy,
+		arg.ID,
+		arg.SiteID,
+	)
+	var i Content
+	err := row.Scan(
+		&i.ID,
+		&i.SiteID,
+		&i.Value,
+		&i.Type,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+		&i.LastEditedBy,
+	)
+	return i, err
+}

insertr-server/internal/db/postgresql/db.go

@@ -0,0 +1,31 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.29.0
+
+package postgresql
+
+import (
+	"context"
+	"database/sql"
+)
+
+type DBTX interface {
+	ExecContext(context.Context, string, ...interface{}) (sql.Result, error)
+	PrepareContext(context.Context, string) (*sql.Stmt, error)
+	QueryContext(context.Context, string, ...interface{}) (*sql.Rows, error)
+	QueryRowContext(context.Context, string, ...interface{}) *sql.Row
+}
+
+func New(db DBTX) *Queries {
+	return &Queries{db: db}
+}
+
+type Queries struct {
+	db DBTX
+}
+
+func (q *Queries) WithTx(tx *sql.Tx) *Queries {
+	return &Queries{
+		db: tx,
+	}
+}

insertr-server/internal/db/postgresql/models.go

@@ -0,0 +1,25 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.29.0
+
+package postgresql
+
+type Content struct {
+	ID           string `json:"id"`
+	SiteID       string `json:"site_id"`
+	Value        string `json:"value"`
+	Type         string `json:"type"`
+	CreatedAt    int64  `json:"created_at"`
+	UpdatedAt    int64  `json:"updated_at"`
+	LastEditedBy string `json:"last_edited_by"`
+}
+
+type ContentVersion struct {
+	VersionID int32  `json:"version_id"`
+	ContentID string `json:"content_id"`
+	SiteID    string `json:"site_id"`
+	Value     string `json:"value"`
+	Type      string `json:"type"`
+	CreatedAt int64  `json:"created_at"`
+	CreatedBy string `json:"created_by"`
+}

insertr-server/internal/db/postgresql/querier.go

@@ -0,0 +1,31 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.29.0
+
+package postgresql
+
+import (
+	"context"
+)
+
+type Querier interface {
+	CreateContent(ctx context.Context, arg CreateContentParams) (Content, error)
+	CreateContentSiteIndex(ctx context.Context) error
+	CreateContentUpdatedAtIndex(ctx context.Context) error
+	CreateContentVersion(ctx context.Context, arg CreateContentVersionParams) error
+	CreateUpdateFunction(ctx context.Context) error
+	CreateVersionsLookupIndex(ctx context.Context) error
+	DeleteContent(ctx context.Context, arg DeleteContentParams) error
+	DeleteOldVersions(ctx context.Context, arg DeleteOldVersionsParams) error
+	GetAllContent(ctx context.Context, siteID string) ([]Content, error)
+	GetAllVersionsForSite(ctx context.Context, arg GetAllVersionsForSiteParams) ([]GetAllVersionsForSiteRow, error)
+	GetBulkContent(ctx context.Context, arg GetBulkContentParams) ([]Content, error)
+	GetContent(ctx context.Context, arg GetContentParams) (Content, error)
+	GetContentVersion(ctx context.Context, versionID int32) (ContentVersion, error)
+	GetContentVersionHistory(ctx context.Context, arg GetContentVersionHistoryParams) ([]ContentVersion, error)
+	InitializeSchema(ctx context.Context) error
+	InitializeVersionsTable(ctx context.Context) error
+	UpdateContent(ctx context.Context, arg UpdateContentParams) (Content, error)
+}
+
+var _ Querier = (*Queries)(nil)

insertr-server/internal/db/postgresql/setup.sql.go

@@ -0,0 +1,87 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.29.0
+// source: setup.sql
+
+package postgresql
+
+import (
+	"context"
+)
+
+const createContentSiteIndex = `-- name: CreateContentSiteIndex :exec
+CREATE INDEX IF NOT EXISTS idx_content_site_id ON content(site_id)
+`
+
+func (q *Queries) CreateContentSiteIndex(ctx context.Context) error {
+	_, err := q.db.ExecContext(ctx, createContentSiteIndex)
+	return err
+}
+
+const createContentUpdatedAtIndex = `-- name: CreateContentUpdatedAtIndex :exec
+CREATE INDEX IF NOT EXISTS idx_content_updated_at ON content(updated_at)
+`
+
+func (q *Queries) CreateContentUpdatedAtIndex(ctx context.Context) error {
+	_, err := q.db.ExecContext(ctx, createContentUpdatedAtIndex)
+	return err
+}
+
+const createUpdateFunction = `-- name: CreateUpdateFunction :exec
+CREATE OR REPLACE FUNCTION update_content_timestamp()
+RETURNS TRIGGER AS $$
+BEGIN
+    NEW.updated_at = EXTRACT(EPOCH FROM NOW());
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql
+`
+
+func (q *Queries) CreateUpdateFunction(ctx context.Context) error {
+	_, err := q.db.ExecContext(ctx, createUpdateFunction)
+	return err
+}
+
+const createVersionsLookupIndex = `-- name: CreateVersionsLookupIndex :exec
+CREATE INDEX IF NOT EXISTS idx_content_versions_lookup ON content_versions(content_id, site_id, created_at DESC)
+`
+
+func (q *Queries) CreateVersionsLookupIndex(ctx context.Context) error {
+	_, err := q.db.ExecContext(ctx, createVersionsLookupIndex)
+	return err
+}
+
+const initializeSchema = `-- name: InitializeSchema :exec
+CREATE TABLE IF NOT EXISTS content (
+    id TEXT NOT NULL,
+    site_id TEXT NOT NULL,
+    value TEXT NOT NULL,
+    type TEXT NOT NULL CHECK (type IN ('text', 'markdown', 'link')),
+    created_at BIGINT DEFAULT (EXTRACT(EPOCH FROM NOW())) NOT NULL,
+    updated_at BIGINT DEFAULT (EXTRACT(EPOCH FROM NOW())) NOT NULL,
+    last_edited_by TEXT DEFAULT 'system' NOT NULL,
+    PRIMARY KEY (id, site_id)
+)
+`
+
+func (q *Queries) InitializeSchema(ctx context.Context) error {
+	_, err := q.db.ExecContext(ctx, initializeSchema)
+	return err
+}
+
+const initializeVersionsTable = `-- name: InitializeVersionsTable :exec
+CREATE TABLE IF NOT EXISTS content_versions (
+    version_id SERIAL PRIMARY KEY,
+    content_id TEXT NOT NULL,
+    site_id TEXT NOT NULL,
+    value TEXT NOT NULL,
+    type TEXT NOT NULL,
+    created_at BIGINT DEFAULT (EXTRACT(EPOCH FROM NOW())) NOT NULL,
+    created_by TEXT DEFAULT 'system' NOT NULL
+)
+`
+
+func (q *Queries) InitializeVersionsTable(ctx context.Context) error {
+	_, err := q.db.ExecContext(ctx, initializeVersionsTable)
+	return err
+}

insertr-server/internal/db/postgresql/versions.sql.go

@@ -0,0 +1,175 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.29.0
+// source: versions.sql
+
+package postgresql
+
+import (
+	"context"
+	"database/sql"
+)
+
+const createContentVersion = `-- name: CreateContentVersion :exec
+INSERT INTO content_versions (content_id, site_id, value, type, created_by)
+VALUES ($1, $2, $3, $4, $5)
+`
+
+type CreateContentVersionParams struct {
+	ContentID string `json:"content_id"`
+	SiteID    string `json:"site_id"`
+	Value     string `json:"value"`
+	Type      string `json:"type"`
+	CreatedBy string `json:"created_by"`
+}
+
+func (q *Queries) CreateContentVersion(ctx context.Context, arg CreateContentVersionParams) error {
+	_, err := q.db.ExecContext(ctx, createContentVersion,
+		arg.ContentID,
+		arg.SiteID,
+		arg.Value,
+		arg.Type,
+		arg.CreatedBy,
+	)
+	return err
+}
+
+const deleteOldVersions = `-- name: DeleteOldVersions :exec
+DELETE FROM content_versions 
+WHERE created_at < $1 AND site_id = $2
+`
+
+type DeleteOldVersionsParams struct {
+	CreatedBefore int64  `json:"created_before"`
+	SiteID        string `json:"site_id"`
+}
+
+func (q *Queries) DeleteOldVersions(ctx context.Context, arg DeleteOldVersionsParams) error {
+	_, err := q.db.ExecContext(ctx, deleteOldVersions, arg.CreatedBefore, arg.SiteID)
+	return err
+}
+
+const getAllVersionsForSite = `-- name: GetAllVersionsForSite :many
+SELECT 
+    cv.version_id, cv.content_id, cv.site_id, cv.value, cv.type, cv.created_at, cv.created_by,
+    c.value as current_value
+FROM content_versions cv
+LEFT JOIN content c ON cv.content_id = c.id AND cv.site_id = c.site_id
+WHERE cv.site_id = $1
+ORDER BY cv.created_at DESC
+LIMIT $2
+`
+
+type GetAllVersionsForSiteParams struct {
+	SiteID     string `json:"site_id"`
+	LimitCount int32  `json:"limit_count"`
+}
+
+type GetAllVersionsForSiteRow struct {
+	VersionID    int32          `json:"version_id"`
+	ContentID    string         `json:"content_id"`
+	SiteID       string         `json:"site_id"`
+	Value        string         `json:"value"`
+	Type         string         `json:"type"`
+	CreatedAt    int64          `json:"created_at"`
+	CreatedBy    string         `json:"created_by"`
+	CurrentValue sql.NullString `json:"current_value"`
+}
+
+func (q *Queries) GetAllVersionsForSite(ctx context.Context, arg GetAllVersionsForSiteParams) ([]GetAllVersionsForSiteRow, error) {
+	rows, err := q.db.QueryContext(ctx, getAllVersionsForSite, arg.SiteID, arg.LimitCount)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []GetAllVersionsForSiteRow
+	for rows.Next() {
+		var i GetAllVersionsForSiteRow
+		if err := rows.Scan(
+			&i.VersionID,
+			&i.ContentID,
+			&i.SiteID,
+			&i.Value,
+			&i.Type,
+			&i.CreatedAt,
+			&i.CreatedBy,
+			&i.CurrentValue,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Close(); err != nil {
+		return nil, err
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
+const getContentVersion = `-- name: GetContentVersion :one
+SELECT version_id, content_id, site_id, value, type, created_at, created_by
+FROM content_versions
+WHERE version_id = $1
+`
+
+func (q *Queries) GetContentVersion(ctx context.Context, versionID int32) (ContentVersion, error) {
+	row := q.db.QueryRowContext(ctx, getContentVersion, versionID)
+	var i ContentVersion
+	err := row.Scan(
+		&i.VersionID,
+		&i.ContentID,
+		&i.SiteID,
+		&i.Value,
+		&i.Type,
+		&i.CreatedAt,
+		&i.CreatedBy,
+	)
+	return i, err
+}
+
+const getContentVersionHistory = `-- name: GetContentVersionHistory :many
+SELECT version_id, content_id, site_id, value, type, created_at, created_by
+FROM content_versions
+WHERE content_id = $1 AND site_id = $2
+ORDER BY created_at DESC
+LIMIT $3
+`
+
+type GetContentVersionHistoryParams struct {
+	ContentID  string `json:"content_id"`
+	SiteID     string `json:"site_id"`
+	LimitCount int32  `json:"limit_count"`
+}
+
+func (q *Queries) GetContentVersionHistory(ctx context.Context, arg GetContentVersionHistoryParams) ([]ContentVersion, error) {
+	rows, err := q.db.QueryContext(ctx, getContentVersionHistory, arg.ContentID, arg.SiteID, arg.LimitCount)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []ContentVersion
+	for rows.Next() {
+		var i ContentVersion
+		if err := rows.Scan(
+			&i.VersionID,
+			&i.ContentID,
+			&i.SiteID,
+			&i.Value,
+			&i.Type,
+			&i.CreatedAt,
+			&i.CreatedBy,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Close(); err != nil {
+		return nil, err
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}

insertr-server/internal/db/sqlite.go

@@ -1,232 +0,0 @@
-package db
-
-import (
-	"database/sql"
-	"fmt"
-	"time"
-
-	"github.com/insertr/server/internal/models"
-	_ "github.com/mattn/go-sqlite3"
-)
-
-// SQLiteDB wraps a SQLite database connection
-type SQLiteDB struct {
-	db *sql.DB
-}
-
-// NewSQLiteDB creates a new SQLite database connection
-func NewSQLiteDB(dbPath string) (*SQLiteDB, error) {
-	db, err := sql.Open("sqlite3", dbPath)
-	if err != nil {
-		return nil, fmt.Errorf("opening database: %w", err)
-	}
-
-	// Test connection
-	if err := db.Ping(); err != nil {
-		return nil, fmt.Errorf("connecting to database: %w", err)
-	}
-
-	sqliteDB := &SQLiteDB{db: db}
-
-	// Initialize schema
-	if err := sqliteDB.initSchema(); err != nil {
-		return nil, fmt.Errorf("initializing schema: %w", err)
-	}
-
-	return sqliteDB, nil
-}
-
-// Close closes the database connection
-func (s *SQLiteDB) Close() error {
-	return s.db.Close()
-}
-
-// initSchema creates the necessary tables
-func (s *SQLiteDB) initSchema() error {
-	schema := `
-	CREATE TABLE IF NOT EXISTS content (
-		id TEXT NOT NULL,
-		site_id TEXT NOT NULL,
-		value TEXT NOT NULL,
-		type TEXT NOT NULL CHECK (type IN ('text', 'markdown', 'link')),
-		created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
-		updated_at DATETIME DEFAULT CURRENT_TIMESTAMP,
-		PRIMARY KEY (id, site_id)
-	);
-
-	CREATE INDEX IF NOT EXISTS idx_content_site_id ON content(site_id);
-	CREATE INDEX IF NOT EXISTS idx_content_updated_at ON content(updated_at);
-
-	-- Trigger to update updated_at timestamp
-	CREATE TRIGGER IF NOT EXISTS update_content_updated_at
-	AFTER UPDATE ON content
-	FOR EACH ROW
-	BEGIN
-		UPDATE content SET updated_at = CURRENT_TIMESTAMP WHERE id = NEW.id AND site_id = NEW.site_id;
-	END;
-	`
-
-	if _, err := s.db.Exec(schema); err != nil {
-		return fmt.Errorf("creating schema: %w", err)
-	}
-
-	return nil
-}
-
-// GetContent fetches a single content item by ID and site ID
-func (s *SQLiteDB) GetContent(siteID, contentID string) (*models.ContentItem, error) {
-	query := `
-		SELECT id, site_id, value, type, created_at, updated_at 
-		FROM content 
-		WHERE id = ? AND site_id = ?
-	`
-
-	var item models.ContentItem
-	err := s.db.QueryRow(query, contentID, siteID).Scan(
-		&item.ID, &item.SiteID, &item.Value, &item.Type, &item.CreatedAt, &item.UpdatedAt,
-	)
-
-	if err == sql.ErrNoRows {
-		return nil, nil // Content not found
-	}
-	if err != nil {
-		return nil, fmt.Errorf("querying content: %w", err)
-	}
-
-	return &item, nil
-}
-
-// GetAllContent fetches all content for a site
-func (s *SQLiteDB) GetAllContent(siteID string) ([]models.ContentItem, error) {
-	query := `
-		SELECT id, site_id, value, type, created_at, updated_at 
-		FROM content 
-		WHERE site_id = ? 
-		ORDER BY updated_at DESC
-	`
-
-	rows, err := s.db.Query(query, siteID)
-	if err != nil {
-		return nil, fmt.Errorf("querying all content: %w", err)
-	}
-	defer rows.Close()
-
-	var items []models.ContentItem
-	for rows.Next() {
-		var item models.ContentItem
-		err := rows.Scan(&item.ID, &item.SiteID, &item.Value, &item.Type, &item.CreatedAt, &item.UpdatedAt)
-		if err != nil {
-			return nil, fmt.Errorf("scanning content row: %w", err)
-		}
-		items = append(items, item)
-	}
-
-	if err := rows.Err(); err != nil {
-		return nil, fmt.Errorf("iterating content rows: %w", err)
-	}
-
-	return items, nil
-}
-
-// GetBulkContent fetches multiple content items by IDs
-func (s *SQLiteDB) GetBulkContent(siteID string, contentIDs []string) ([]models.ContentItem, error) {
-	if len(contentIDs) == 0 {
-		return []models.ContentItem{}, nil
-	}
-
-	// Build placeholders for IN clause
-	placeholders := make([]interface{}, len(contentIDs)+1)
-	placeholders[0] = siteID
-	for i, id := range contentIDs {
-		placeholders[i+1] = id
-	}
-
-	// Build query with proper number of placeholders
-	query := fmt.Sprintf(`
-		SELECT id, site_id, value, type, created_at, updated_at 
-		FROM content 
-		WHERE site_id = ? AND id IN (%s)
-		ORDER BY updated_at DESC
-	`, buildPlaceholders(len(contentIDs)))
-
-	rows, err := s.db.Query(query, placeholders...)
-	if err != nil {
-		return nil, fmt.Errorf("querying bulk content: %w", err)
-	}
-	defer rows.Close()
-
-	var items []models.ContentItem
-	for rows.Next() {
-		var item models.ContentItem
-		err := rows.Scan(&item.ID, &item.SiteID, &item.Value, &item.Type, &item.CreatedAt, &item.UpdatedAt)
-		if err != nil {
-			return nil, fmt.Errorf("scanning bulk content row: %w", err)
-		}
-		items = append(items, item)
-	}
-
-	return items, nil
-}
-
-// CreateContent creates a new content item
-func (s *SQLiteDB) CreateContent(siteID, contentID, value, contentType string) (*models.ContentItem, error) {
-	now := time.Now()
-
-	query := `
-		INSERT INTO content (id, site_id, value, type, created_at, updated_at)
-		VALUES (?, ?, ?, ?, ?, ?)
-	`
-
-	_, err := s.db.Exec(query, contentID, siteID, value, contentType, now, now)
-	if err != nil {
-		return nil, fmt.Errorf("creating content: %w", err)
-	}
-
-	return &models.ContentItem{
-		ID:        contentID,
-		SiteID:    siteID,
-		Value:     value,
-		Type:      contentType,
-		CreatedAt: now,
-		UpdatedAt: now,
-	}, nil
-}
-
-// UpdateContent updates an existing content item
-func (s *SQLiteDB) UpdateContent(siteID, contentID, value string) (*models.ContentItem, error) {
-	// First check if content exists
-	existing, err := s.GetContent(siteID, contentID)
-	if err != nil {
-		return nil, fmt.Errorf("checking existing content: %w", err)
-	}
-	if existing == nil {
-		return nil, fmt.Errorf("content not found: %s", contentID)
-	}
-
-	query := `
-		UPDATE content 
-		SET value = ?, updated_at = CURRENT_TIMESTAMP 
-		WHERE id = ? AND site_id = ?
-	`
-
-	_, err = s.db.Exec(query, value, contentID, siteID)
-	if err != nil {
-		return nil, fmt.Errorf("updating content: %w", err)
-	}
-
-	// Fetch and return updated content
-	return s.GetContent(siteID, contentID)
-}
-
-// buildPlaceholders creates a string of SQL placeholders like "?,?,?"
-func buildPlaceholders(count int) string {
-	if count == 0 {
-		return ""
-	}
-
-	result := "?"
-	for i := 1; i < count; i++ {
-		result += ",?"
-	}
-	return result
-}

insertr-server/internal/db/sqlite/content.sql.go

@@ -0,0 +1,214 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.29.0
+// source: content.sql
+
+package sqlite
+
+import (
+	"context"
+	"strings"
+)
+
+const createContent = `-- name: CreateContent :one
+INSERT INTO content (id, site_id, value, type, last_edited_by)
+VALUES (?1, ?2, ?3, ?4, ?5)
+RETURNING id, site_id, value, type, created_at, updated_at, last_edited_by
+`
+
+type CreateContentParams struct {
+	ID           string `json:"id"`
+	SiteID       string `json:"site_id"`
+	Value        string `json:"value"`
+	Type         string `json:"type"`
+	LastEditedBy string `json:"last_edited_by"`
+}
+
+func (q *Queries) CreateContent(ctx context.Context, arg CreateContentParams) (Content, error) {
+	row := q.db.QueryRowContext(ctx, createContent,
+		arg.ID,
+		arg.SiteID,
+		arg.Value,
+		arg.Type,
+		arg.LastEditedBy,
+	)
+	var i Content
+	err := row.Scan(
+		&i.ID,
+		&i.SiteID,
+		&i.Value,
+		&i.Type,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+		&i.LastEditedBy,
+	)
+	return i, err
+}
+
+const deleteContent = `-- name: DeleteContent :exec
+DELETE FROM content 
+WHERE id = ?1 AND site_id = ?2
+`
+
+type DeleteContentParams struct {
+	ID     string `json:"id"`
+	SiteID string `json:"site_id"`
+}
+
+func (q *Queries) DeleteContent(ctx context.Context, arg DeleteContentParams) error {
+	_, err := q.db.ExecContext(ctx, deleteContent, arg.ID, arg.SiteID)
+	return err
+}
+
+const getAllContent = `-- name: GetAllContent :many
+SELECT id, site_id, value, type, created_at, updated_at, last_edited_by
+FROM content 
+WHERE site_id = ?1
+ORDER BY updated_at DESC
+`
+
+func (q *Queries) GetAllContent(ctx context.Context, siteID string) ([]Content, error) {
+	rows, err := q.db.QueryContext(ctx, getAllContent, siteID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []Content
+	for rows.Next() {
+		var i Content
+		if err := rows.Scan(
+			&i.ID,
+			&i.SiteID,
+			&i.Value,
+			&i.Type,
+			&i.CreatedAt,
+			&i.UpdatedAt,
+			&i.LastEditedBy,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Close(); err != nil {
+		return nil, err
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
+const getBulkContent = `-- name: GetBulkContent :many
+SELECT id, site_id, value, type, created_at, updated_at, last_edited_by
+FROM content 
+WHERE site_id = ?1 AND id IN (/*SLICE:ids*/?)
+`
+
+type GetBulkContentParams struct {
+	SiteID string   `json:"site_id"`
+	Ids    []string `json:"ids"`
+}
+
+func (q *Queries) GetBulkContent(ctx context.Context, arg GetBulkContentParams) ([]Content, error) {
+	query := getBulkContent
+	var queryParams []interface{}
+	queryParams = append(queryParams, arg.SiteID)
+	if len(arg.Ids) > 0 {
+		for _, v := range arg.Ids {
+			queryParams = append(queryParams, v)
+		}
+		query = strings.Replace(query, "/*SLICE:ids*/?", strings.Repeat(",?", len(arg.Ids))[1:], 1)
+	} else {
+		query = strings.Replace(query, "/*SLICE:ids*/?", "NULL", 1)
+	}
+	rows, err := q.db.QueryContext(ctx, query, queryParams...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []Content
+	for rows.Next() {
+		var i Content
+		if err := rows.Scan(
+			&i.ID,
+			&i.SiteID,
+			&i.Value,
+			&i.Type,
+			&i.CreatedAt,
+			&i.UpdatedAt,
+			&i.LastEditedBy,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Close(); err != nil {
+		return nil, err
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
+const getContent = `-- name: GetContent :one
+SELECT id, site_id, value, type, created_at, updated_at, last_edited_by
+FROM content 
+WHERE id = ?1 AND site_id = ?2
+`
+
+type GetContentParams struct {
+	ID     string `json:"id"`
+	SiteID string `json:"site_id"`
+}
+
+func (q *Queries) GetContent(ctx context.Context, arg GetContentParams) (Content, error) {
+	row := q.db.QueryRowContext(ctx, getContent, arg.ID, arg.SiteID)
+	var i Content
+	err := row.Scan(
+		&i.ID,
+		&i.SiteID,
+		&i.Value,
+		&i.Type,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+		&i.LastEditedBy,
+	)
+	return i, err
+}
+
+const updateContent = `-- name: UpdateContent :one
+UPDATE content 
+SET value = ?1, type = ?2, last_edited_by = ?3
+WHERE id = ?4 AND site_id = ?5
+RETURNING id, site_id, value, type, created_at, updated_at, last_edited_by
+`
+
+type UpdateContentParams struct {
+	Value        string `json:"value"`
+	Type         string `json:"type"`
+	LastEditedBy string `json:"last_edited_by"`
+	ID           string `json:"id"`
+	SiteID       string `json:"site_id"`
+}
+
+func (q *Queries) UpdateContent(ctx context.Context, arg UpdateContentParams) (Content, error) {
+	row := q.db.QueryRowContext(ctx, updateContent,
+		arg.Value,
+		arg.Type,
+		arg.LastEditedBy,
+		arg.ID,
+		arg.SiteID,
+	)
+	var i Content
+	err := row.Scan(
+		&i.ID,
+		&i.SiteID,
+		&i.Value,
+		&i.Type,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+		&i.LastEditedBy,
+	)
+	return i, err
+}

insertr-server/internal/db/sqlite/db.go

@@ -0,0 +1,31 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.29.0
+
+package sqlite
+
+import (
+	"context"
+	"database/sql"
+)
+
+type DBTX interface {
+	ExecContext(context.Context, string, ...interface{}) (sql.Result, error)
+	PrepareContext(context.Context, string) (*sql.Stmt, error)
+	QueryContext(context.Context, string, ...interface{}) (*sql.Rows, error)
+	QueryRowContext(context.Context, string, ...interface{}) *sql.Row
+}
+
+func New(db DBTX) *Queries {
+	return &Queries{db: db}
+}
+
+type Queries struct {
+	db DBTX
+}
+
+func (q *Queries) WithTx(tx *sql.Tx) *Queries {
+	return &Queries{
+		db: tx,
+	}
+}

insertr-server/internal/db/sqlite/models.go

@@ -0,0 +1,25 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.29.0
+
+package sqlite
+
+type Content struct {
+	ID           string `json:"id"`
+	SiteID       string `json:"site_id"`
+	Value        string `json:"value"`
+	Type         string `json:"type"`
+	CreatedAt    int64  `json:"created_at"`
+	UpdatedAt    int64  `json:"updated_at"`
+	LastEditedBy string `json:"last_edited_by"`
+}
+
+type ContentVersion struct {
+	VersionID int64  `json:"version_id"`
+	ContentID string `json:"content_id"`
+	SiteID    string `json:"site_id"`
+	Value     string `json:"value"`
+	Type      string `json:"type"`
+	CreatedAt int64  `json:"created_at"`
+	CreatedBy string `json:"created_by"`
+}

insertr-server/internal/db/sqlite/querier.go

@@ -0,0 +1,27 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.29.0
+
+package sqlite
+
+import (
+	"context"
+)
+
+type Querier interface {
+	CreateContent(ctx context.Context, arg CreateContentParams) (Content, error)
+	CreateContentVersion(ctx context.Context, arg CreateContentVersionParams) error
+	DeleteContent(ctx context.Context, arg DeleteContentParams) error
+	DeleteOldVersions(ctx context.Context, arg DeleteOldVersionsParams) error
+	GetAllContent(ctx context.Context, siteID string) ([]Content, error)
+	GetAllVersionsForSite(ctx context.Context, arg GetAllVersionsForSiteParams) ([]GetAllVersionsForSiteRow, error)
+	GetBulkContent(ctx context.Context, arg GetBulkContentParams) ([]Content, error)
+	GetContent(ctx context.Context, arg GetContentParams) (Content, error)
+	GetContentVersion(ctx context.Context, versionID int64) (ContentVersion, error)
+	GetContentVersionHistory(ctx context.Context, arg GetContentVersionHistoryParams) ([]ContentVersion, error)
+	InitializeSchema(ctx context.Context) error
+	InitializeVersionsTable(ctx context.Context) error
+	UpdateContent(ctx context.Context, arg UpdateContentParams) (Content, error)
+}
+
+var _ Querier = (*Queries)(nil)

insertr-server/internal/db/sqlite/setup.sql.go

@@ -0,0 +1,45 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.29.0
+// source: setup.sql
+
+package sqlite
+
+import (
+	"context"
+)
+
+const initializeSchema = `-- name: InitializeSchema :exec
+CREATE TABLE IF NOT EXISTS content (
+    id TEXT NOT NULL,
+    site_id TEXT NOT NULL,
+    value TEXT NOT NULL,
+    type TEXT NOT NULL CHECK (type IN ('text', 'markdown', 'link')),
+    created_at INTEGER DEFAULT (strftime('%s', 'now')) NOT NULL,
+    updated_at INTEGER DEFAULT (strftime('%s', 'now')) NOT NULL,
+    last_edited_by TEXT DEFAULT 'system' NOT NULL,
+    PRIMARY KEY (id, site_id)
+)
+`
+
+func (q *Queries) InitializeSchema(ctx context.Context) error {
+	_, err := q.db.ExecContext(ctx, initializeSchema)
+	return err
+}
+
+const initializeVersionsTable = `-- name: InitializeVersionsTable :exec
+CREATE TABLE IF NOT EXISTS content_versions (
+    version_id INTEGER PRIMARY KEY AUTOINCREMENT,
+    content_id TEXT NOT NULL,
+    site_id TEXT NOT NULL,
+    value TEXT NOT NULL,
+    type TEXT NOT NULL,
+    created_at INTEGER DEFAULT (strftime('%s', 'now')) NOT NULL,
+    created_by TEXT DEFAULT 'system' NOT NULL
+)
+`
+
+func (q *Queries) InitializeVersionsTable(ctx context.Context) error {
+	_, err := q.db.ExecContext(ctx, initializeVersionsTable)
+	return err
+}

insertr-server/internal/db/sqlite/versions.sql.go

@@ -0,0 +1,175 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.29.0
+// source: versions.sql
+
+package sqlite
+
+import (
+	"context"
+	"database/sql"
+)
+
+const createContentVersion = `-- name: CreateContentVersion :exec
+INSERT INTO content_versions (content_id, site_id, value, type, created_by)
+VALUES (?1, ?2, ?3, ?4, ?5)
+`
+
+type CreateContentVersionParams struct {
+	ContentID string `json:"content_id"`
+	SiteID    string `json:"site_id"`
+	Value     string `json:"value"`
+	Type      string `json:"type"`
+	CreatedBy string `json:"created_by"`
+}
+
+func (q *Queries) CreateContentVersion(ctx context.Context, arg CreateContentVersionParams) error {
+	_, err := q.db.ExecContext(ctx, createContentVersion,
+		arg.ContentID,
+		arg.SiteID,
+		arg.Value,
+		arg.Type,
+		arg.CreatedBy,
+	)
+	return err
+}
+
+const deleteOldVersions = `-- name: DeleteOldVersions :exec
+DELETE FROM content_versions 
+WHERE created_at < ?1 AND site_id = ?2
+`
+
+type DeleteOldVersionsParams struct {
+	CreatedBefore int64  `json:"created_before"`
+	SiteID        string `json:"site_id"`
+}
+
+func (q *Queries) DeleteOldVersions(ctx context.Context, arg DeleteOldVersionsParams) error {
+	_, err := q.db.ExecContext(ctx, deleteOldVersions, arg.CreatedBefore, arg.SiteID)
+	return err
+}
+
+const getAllVersionsForSite = `-- name: GetAllVersionsForSite :many
+SELECT 
+    cv.version_id, cv.content_id, cv.site_id, cv.value, cv.type, cv.created_at, cv.created_by,
+    c.value as current_value
+FROM content_versions cv
+LEFT JOIN content c ON cv.content_id = c.id AND cv.site_id = c.site_id
+WHERE cv.site_id = ?1
+ORDER BY cv.created_at DESC
+LIMIT ?2
+`
+
+type GetAllVersionsForSiteParams struct {
+	SiteID     string `json:"site_id"`
+	LimitCount int64  `json:"limit_count"`
+}
+
+type GetAllVersionsForSiteRow struct {
+	VersionID    int64          `json:"version_id"`
+	ContentID    string         `json:"content_id"`
+	SiteID       string         `json:"site_id"`
+	Value        string         `json:"value"`
+	Type         string         `json:"type"`
+	CreatedAt    int64          `json:"created_at"`
+	CreatedBy    string         `json:"created_by"`
+	CurrentValue sql.NullString `json:"current_value"`
+}
+
+func (q *Queries) GetAllVersionsForSite(ctx context.Context, arg GetAllVersionsForSiteParams) ([]GetAllVersionsForSiteRow, error) {
+	rows, err := q.db.QueryContext(ctx, getAllVersionsForSite, arg.SiteID, arg.LimitCount)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []GetAllVersionsForSiteRow
+	for rows.Next() {
+		var i GetAllVersionsForSiteRow
+		if err := rows.Scan(
+			&i.VersionID,
+			&i.ContentID,
+			&i.SiteID,
+			&i.Value,
+			&i.Type,
+			&i.CreatedAt,
+			&i.CreatedBy,
+			&i.CurrentValue,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Close(); err != nil {
+		return nil, err
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
+const getContentVersion = `-- name: GetContentVersion :one
+SELECT version_id, content_id, site_id, value, type, created_at, created_by
+FROM content_versions
+WHERE version_id = ?1
+`
+
+func (q *Queries) GetContentVersion(ctx context.Context, versionID int64) (ContentVersion, error) {
+	row := q.db.QueryRowContext(ctx, getContentVersion, versionID)
+	var i ContentVersion
+	err := row.Scan(
+		&i.VersionID,
+		&i.ContentID,
+		&i.SiteID,
+		&i.Value,
+		&i.Type,
+		&i.CreatedAt,
+		&i.CreatedBy,
+	)
+	return i, err
+}
+
+const getContentVersionHistory = `-- name: GetContentVersionHistory :many
+SELECT version_id, content_id, site_id, value, type, created_at, created_by
+FROM content_versions
+WHERE content_id = ?1 AND site_id = ?2
+ORDER BY created_at DESC
+LIMIT ?3
+`
+
+type GetContentVersionHistoryParams struct {
+	ContentID  string `json:"content_id"`
+	SiteID     string `json:"site_id"`
+	LimitCount int64  `json:"limit_count"`
+}
+
+func (q *Queries) GetContentVersionHistory(ctx context.Context, arg GetContentVersionHistoryParams) ([]ContentVersion, error) {
+	rows, err := q.db.QueryContext(ctx, getContentVersionHistory, arg.ContentID, arg.SiteID, arg.LimitCount)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []ContentVersion
+	for rows.Next() {
+		var i ContentVersion
+		if err := rows.Scan(
+			&i.VersionID,
+			&i.ContentID,
+			&i.SiteID,
+			&i.Value,
+			&i.Type,
+			&i.CreatedAt,
+			&i.CreatedBy,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Close(); err != nil {
+		return nil, err
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}

insertr-server/internal/models/content.go

@@ -1,34 +0,0 @@
-package models
-
-import (
-	"time"
-)
-
-// ContentItem represents a piece of content in the database
-// This matches the structure used by the CLI client and JavaScript client
-type ContentItem struct {
-	ID        string    `json:"id" db:"id"`
-	SiteID    string    `json:"site_id" db:"site_id"`
-	Value     string    `json:"value" db:"value"`
-	Type      string    `json:"type" db:"type"`
-	CreatedAt time.Time `json:"created_at" db:"created_at"`
-	UpdatedAt time.Time `json:"updated_at" db:"updated_at"`
-}
-
-// ContentResponse represents the API response structure for multiple items
-type ContentResponse struct {
-	Content []ContentItem `json:"content"`
-	Error   string        `json:"error,omitempty"`
-}
-
-// CreateContentRequest represents the request structure for creating content
-type CreateContentRequest struct {
-	ID    string `json:"id" validate:"required"`
-	Value string `json:"value" validate:"required"`
-	Type  string `json:"type" validate:"required,oneof=text markdown link"`
-}
-
-// UpdateContentRequest represents the request structure for updating content
-type UpdateContentRequest struct {
-	Value string `json:"value" validate:"required"`
-}