feat(banners): instance announcements — admin CRUD, top bar, CLI (#39)

banners table (title/body/level/active/dismissible/schedule window).
GET /banners/active for signed-in users; admin CRUD under /admin/banners.
BannerBar renders above the header with per-banner dismissal
(localStorage); admin console gains an Announcements section;
`containr banners` manages them and `auth status` prints active ones.

Generated with [Devin](https://devin.ai)

Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

app/backend/internal/api/banners.go

@@ -0,0 +1,225 @@
+package api
+
+import (
+	"database/sql"
+	"net/http"
+	"time"
+
+	"containr/internal/database"
+	"containr/internal/database/sqlcdb"
+
+	"github.com/gin-gonic/gin"
+	"github.com/google/uuid"
+)
+
+// Instance-wide announcement banners. Admins manage them under
+// /admin/banners; every signed-in user reads the active set at
+// /banners/active so the UI (and CLI) can surface announcements.
+
+var bannerLevels = map[string]bool{"info": true, "success": true, "warning": true, "error": true}
+
+// bannerJSON flattens sqlc nullable wrappers into plain API values.
+type bannerJSON struct {
+	ID          string     `json:"id"`
+	Title       string     `json:"title"`
+	Body        string     `json:"body"`
+	Level       string     `json:"level"`
+	Active      bool       `json:"active"`
+	Dismissible bool       `json:"dismissible"`
+	StartsAt    *time.Time `json:"starts_at,omitempty"`
+	EndsAt      *time.Time `json:"ends_at,omitempty"`
+	CreatedAt   *time.Time `json:"created_at,omitempty"`
+}
+
+func toBannerJSON(b sqlcdb.Banner) bannerJSON {
+	out := bannerJSON{
+		ID:          b.ID.String(),
+		Title:       b.Title,
+		Body:        b.Body,
+		Level:       b.Level,
+		Active:      b.Active,
+		Dismissible: b.Dismissible,
+	}
+	if b.StartsAt.Valid {
+		out.StartsAt = &b.StartsAt.Time
+	}
+	if b.EndsAt.Valid {
+		out.EndsAt = &b.EndsAt.Time
+	}
+	if b.CreatedAt.Valid {
+		out.CreatedAt = &b.CreatedAt.Time
+	}
+	return out
+}
+
+func toBannerList(banners []sqlcdb.Banner) []bannerJSON {
+	out := make([]bannerJSON, 0, len(banners))
+	for _, b := range banners {
+		out = append(out, toBannerJSON(b))
+	}
+	return out
+}
+
+type bannerRequest struct {
+	Title       *string    `json:"title"`
+	Body        *string    `json:"body"`
+	Level       *string    `json:"level"`
+	Active      *bool      `json:"active"`
+	Dismissible *bool      `json:"dismissible"`
+	StartsAt    *time.Time `json:"starts_at"`
+	EndsAt      *time.Time `json:"ends_at"`
+}
+
+func bannerQueries(c *gin.Context) *sqlcdb.Queries {
+	db := c.MustGet("db").(*database.DB)
+	return sqlcdb.New(db.DB)
+}
+
+func parseBannerID(c *gin.Context) (uuid.UUID, bool) {
+	id, err := uuid.Parse(c.Param("id"))
+	if err != nil {
+		respondError(c, http.StatusBadRequest, "INVALID_ID", "invalid banner id")
+		return uuid.Nil, false
+	}
+	return id, true
+}
+
+func validBannerLevel(level string) bool { return bannerLevels[level] }
+
+func handleListActiveBanners(c *gin.Context) {
+	banners, err := bannerQueries(c).ListActiveBanners(c.Request.Context())
+	if err != nil {
+		respondError(c, http.StatusInternalServerError, "INTERNAL", "failed to list banners")
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"banners": toBannerList(banners)})
+}
+
+func handleAdminListBanners(c *gin.Context) {
+	banners, err := bannerQueries(c).ListBanners(c.Request.Context())
+	if err != nil {
+		respondError(c, http.StatusInternalServerError, "INTERNAL", "failed to list banners")
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"banners": toBannerList(banners)})
+}
+
+func handleAdminCreateBanner(c *gin.Context) {
+	var req bannerRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		respondError(c, http.StatusBadRequest, "INVALID_BODY", "invalid request body")
+		return
+	}
+	if req.Title == nil || *req.Title == "" {
+		respondError(c, http.StatusBadRequest, "VALIDATION", "title is required")
+		return
+	}
+	level := "info"
+	if req.Level != nil {
+		if !validBannerLevel(*req.Level) {
+			respondError(c, http.StatusBadRequest, "VALIDATION", "level must be info, success, warning or error")
+			return
+		}
+		level = *req.Level
+	}
+	userID, _ := requireAuthenticatedUserUUID(c)
+	params := sqlcdb.CreateBannerParams{
+		Title:       *req.Title,
+		Level:       level,
+		Active:      true,
+		Dismissible: true,
+		CreatedBy:   uuid.NullUUID{UUID: userID, Valid: true},
+	}
+	if req.Body != nil {
+		params.Body = *req.Body
+	}
+	if req.Active != nil {
+		params.Active = *req.Active
+	}
+	if req.Dismissible != nil {
+		params.Dismissible = *req.Dismissible
+	}
+	if req.StartsAt != nil {
+		params.StartsAt = sql.NullTime{Time: *req.StartsAt, Valid: true}
+	}
+	if req.EndsAt != nil {
+		params.EndsAt = sql.NullTime{Time: *req.EndsAt, Valid: true}
+	}
+	banner, err := bannerQueries(c).CreateBanner(c.Request.Context(), params)
+	if err != nil {
+		respondError(c, http.StatusInternalServerError, "INTERNAL", "failed to create banner")
+		return
+	}
+	c.JSON(http.StatusCreated, toBannerJSON(banner))
+}
+
+func handleAdminUpdateBanner(c *gin.Context) {
+	id, ok := parseBannerID(c)
+	if !ok {
+		return
+	}
+	q := bannerQueries(c)
+	banner, err := q.GetBannerByID(c.Request.Context(), id)
+	if err != nil {
+		respondError(c, http.StatusNotFound, "NOT_FOUND", "banner not found")
+		return
+	}
+	var req bannerRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		respondError(c, http.StatusBadRequest, "INVALID_BODY", "invalid request body")
+		return
+	}
+	params := sqlcdb.UpdateBannerParams{
+		ID:          id,
+		Title:       banner.Title,
+		Body:        banner.Body,
+		Level:       banner.Level,
+		Active:      banner.Active,
+		Dismissible: banner.Dismissible,
+		StartsAt:    banner.StartsAt,
+		EndsAt:      banner.EndsAt,
+	}
+	if req.Title != nil {
+		params.Title = *req.Title
+	}
+	if req.Body != nil {
+		params.Body = *req.Body
+	}
+	if req.Level != nil {
+		if !validBannerLevel(*req.Level) {
+			respondError(c, http.StatusBadRequest, "VALIDATION", "level must be info, success, warning or error")
+			return
+		}
+		params.Level = *req.Level
+	}
+	if req.Active != nil {
+		params.Active = *req.Active
+	}
+	if req.Dismissible != nil {
+		params.Dismissible = *req.Dismissible
+	}
+	if req.StartsAt != nil {
+		params.StartsAt = sql.NullTime{Time: *req.StartsAt, Valid: true}
+	}
+	if req.EndsAt != nil {
+		params.EndsAt = sql.NullTime{Time: *req.EndsAt, Valid: true}
+	}
+	updated, err := q.UpdateBanner(c.Request.Context(), params)
+	if err != nil {
+		respondError(c, http.StatusInternalServerError, "INTERNAL", "failed to update banner")
+		return
+	}
+	c.JSON(http.StatusOK, toBannerJSON(updated))
+}
+
+func handleAdminDeleteBanner(c *gin.Context) {
+	id, ok := parseBannerID(c)
+	if !ok {
+		return
+	}
+	if err := bannerQueries(c).DeleteBanner(c.Request.Context(), id); err != nil {
+		respondError(c, http.StatusInternalServerError, "INTERNAL", "failed to delete banner")
+		return
+	}
+	c.Status(http.StatusNoContent)
+}

app/backend/internal/api/routes.go

@@ -336,6 +336,9 @@ func SetupRoutes(router *gin.Engine, db *database.DB, redis *database.Redis, cfg
 			// Cross-cutting ops view — active/queued/failed work
 			authed.GET("/operations", handleGetOperations)
 
+			// Instance announcements shown to all signed-in users
+			authed.GET("/banners/active", handleListActiveBanners)
+
 			// Outbound webhooks — signed event delivery to user HTTP endpoints
 			authed.GET("/webhooks", handleListOutboundWebhooks)
 			authed.POST("/webhooks", handleCreateOutboundWebhook)
@@ -485,6 +488,12 @@ func SetupRoutes(router *gin.Engine, db *database.DB, redis *database.Redis, cfg
 
 			admin.GET("/admin/volumes", handleAdminListVolumes)
 			admin.DELETE("/admin/volumes/:name", handleAdminDeleteVolume)
+
+			// Announcement banners
+			admin.GET("/admin/banners", handleAdminListBanners)
+			admin.POST("/admin/banners", handleAdminCreateBanner)
+			admin.PATCH("/admin/banners/:id", handleAdminUpdateBanner)
+			admin.DELETE("/admin/banners/:id", handleAdminDeleteBanner)
 			admin.GET("/audit-logs", handleGetAuditLogs)
 			admin.GET("/audit-logs/:resource/:id", handleGetResourceAuditLogs)
 

app/backend/internal/cli/commands/auth.go

@@ -147,5 +147,21 @@ func runStatus(cmd *cobra.Command, args []string) error {
 	if p.IsAdmin {
 		fmt.Println("Role:     platform admin")
 	}
+
+	var bannersResp struct {
+		Banners []struct {
+			Title string `json:"title"`
+			Body  string `json:"body"`
+			Level string `json:"level"`
+		} `json:"banners"`
+	}
+	if err := client.DoJSON("GET", "/banners/active", nil, &bannersResp); err == nil {
+		for _, b := range bannersResp.Banners {
+			fmt.Printf("[%s] %s\n", b.Level, b.Title)
+			if b.Body != "" {
+				fmt.Printf("      %s\n", b.Body)
+			}
+		}
+	}
 	return nil
 }

app/backend/internal/cli/commands/banners.go

@@ -0,0 +1,133 @@
+package commands
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+var (
+	bannerTitle  string
+	bannerLevel  string
+	bannerBody   string
+	bannerActive bool
+)
+
+// BannersCmd manages instance-wide announcement banners (admin).
+var BannersCmd = &cobra.Command{
+	Use:   "banners",
+	Short: "Manage announcement banners (admin)",
+}
+
+var bannerListCmd = &cobra.Command{
+	Use:   "list",
+	Short: "List all banners",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		c, err := client()
+		if err != nil {
+			return err
+		}
+		data, err := c.Do("GET", "/admin/banners", nil)
+		if err != nil {
+			return err
+		}
+		items, err := unwrapList(data, "banners")
+		if err != nil {
+			return err
+		}
+		rows := make([][]string, 0, len(items))
+		for _, b := range items {
+			rows = append(rows, []string{
+				str(b, "id"), str(b, "title"), str(b, "level"), str(b, "active"),
+			})
+		}
+		printRows(data, []string{"ID", "TITLE", "LEVEL", "ACTIVE"}, rows)
+		return nil
+	},
+}
+
+var bannerCreateCmd = &cobra.Command{
+	Use:   "create <title>",
+	Short: "Create a banner (--body --level info|success|warning|error)",
+	Args:  cobra.ExactArgs(1),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		c, err := client()
+		if err != nil {
+			return err
+		}
+		req := map[string]interface{}{"title": args[0]}
+		if cmd.Flags().Changed("body") {
+			req["body"] = bannerBody
+		}
+		if cmd.Flags().Changed("level") {
+			req["level"] = bannerLevel
+		}
+		data, err := c.Do("POST", "/admin/banners", req)
+		if err != nil {
+			return err
+		}
+		PrintRaw(data)
+		return nil
+	},
+}
+
+var bannerUpdateCmd = &cobra.Command{
+	Use:   "update <id>",
+	Short: "Update a banner (--title --body --level --active/--inactive)",
+	Args:  cobra.ExactArgs(1),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		c, err := client()
+		if err != nil {
+			return err
+		}
+		req := map[string]interface{}{}
+		if cmd.Flags().Changed("title") {
+			req["title"] = bannerTitle
+		}
+		if cmd.Flags().Changed("body") {
+			req["body"] = bannerBody
+		}
+		if cmd.Flags().Changed("level") {
+			req["level"] = bannerLevel
+		}
+		if cmd.Flags().Changed("active") {
+			req["active"] = bannerActive
+		}
+		if len(req) == 0 {
+			return fmt.Errorf("nothing to update — pass --title/--body/--level/--active")
+		}
+		data, err := c.Do("PATCH", "/admin/banners/"+args[0], req)
+		if err != nil {
+			return err
+		}
+		PrintRaw(data)
+		return nil
+	},
+}
+
+var bannerDeleteCmd = &cobra.Command{
+	Use:   "delete <id>",
+	Short: "Delete a banner",
+	Args:  cobra.ExactArgs(1),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		if !Confirm("Delete banner " + args[0] + "?") {
+			return &APIError{Message: "aborted (pass --yes to skip confirmation)", ExitCode: ExitError}
+		}
+		c, err := client()
+		if err != nil {
+			return err
+		}
+		_, err = c.Do("DELETE", "/admin/banners/"+args[0], nil)
+		return err
+	},
+}
+
+func init() {
+	bannerCreateCmd.Flags().StringVar(&bannerBody, "body", "", "banner body text")
+	bannerCreateCmd.Flags().StringVar(&bannerLevel, "level", "info", "info|success|warning|error")
+	bannerUpdateCmd.Flags().StringVar(&bannerTitle, "title", "", "new title")
+	bannerUpdateCmd.Flags().StringVar(&bannerBody, "body", "", "new body")
+	bannerUpdateCmd.Flags().StringVar(&bannerLevel, "level", "", "info|success|warning|error")
+	bannerUpdateCmd.Flags().BoolVar(&bannerActive, "active", true, "set banner active/inactive")
+	BannersCmd.AddCommand(bannerListCmd, bannerCreateCmd, bannerUpdateCmd, bannerDeleteCmd)
+}

app/backend/internal/cli/root.go

@@ -89,6 +89,7 @@ func init() {
 	rootCmd.AddCommand(commands.NotificationsCmd)
 	rootCmd.AddCommand(commands.WebhooksCmd)
 	rootCmd.AddCommand(commands.OperationsCmd)
+	rootCmd.AddCommand(commands.BannersCmd)
 	rootCmd.AddCommand(commands.UpCmd)
 }
 

app/backend/internal/database/sqlcdb/banners.sql.go

@@ -0,0 +1,231 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.31.1
+// source: banners.sql
+
+package sqlcdb
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/google/uuid"
+)
+
+const createBanner = `-- name: CreateBanner :one
+INSERT INTO banners (title, body, level, active, dismissible, created_by, starts_at, ends_at)
+VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
+RETURNING banners.id, banners.title, banners.body, banners.level, banners.active, banners.dismissible, banners.created_by, banners.starts_at, banners.ends_at, banners.created_at, banners.updated_at
+`
+
+type CreateBannerParams struct {
+	Title       string        `json:"title"`
+	Body        string        `json:"body"`
+	Level       string        `json:"level"`
+	Active      bool          `json:"active"`
+	Dismissible bool          `json:"dismissible"`
+	CreatedBy   uuid.NullUUID `json:"created_by"`
+	StartsAt    sql.NullTime  `json:"starts_at"`
+	EndsAt      sql.NullTime  `json:"ends_at"`
+}
+
+func (q *Queries) CreateBanner(ctx context.Context, arg CreateBannerParams) (Banner, error) {
+	row := q.db.QueryRowContext(ctx, createBanner,
+		arg.Title,
+		arg.Body,
+		arg.Level,
+		arg.Active,
+		arg.Dismissible,
+		arg.CreatedBy,
+		arg.StartsAt,
+		arg.EndsAt,
+	)
+	var i Banner
+	err := row.Scan(
+		&i.ID,
+		&i.Title,
+		&i.Body,
+		&i.Level,
+		&i.Active,
+		&i.Dismissible,
+		&i.CreatedBy,
+		&i.StartsAt,
+		&i.EndsAt,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+	)
+	return i, err
+}
+
+const deleteBanner = `-- name: DeleteBanner :exec
+DELETE FROM banners
+WHERE id = $1
+`
+
+func (q *Queries) DeleteBanner(ctx context.Context, id uuid.UUID) error {
+	_, err := q.db.ExecContext(ctx, deleteBanner, id)
+	return err
+}
+
+const getBannerByID = `-- name: GetBannerByID :one
+SELECT banners.id, banners.title, banners.body, banners.level, banners.active, banners.dismissible, banners.created_by, banners.starts_at, banners.ends_at, banners.created_at, banners.updated_at
+FROM banners
+WHERE id = $1
+`
+
+func (q *Queries) GetBannerByID(ctx context.Context, id uuid.UUID) (Banner, error) {
+	row := q.db.QueryRowContext(ctx, getBannerByID, id)
+	var i Banner
+	err := row.Scan(
+		&i.ID,
+		&i.Title,
+		&i.Body,
+		&i.Level,
+		&i.Active,
+		&i.Dismissible,
+		&i.CreatedBy,
+		&i.StartsAt,
+		&i.EndsAt,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+	)
+	return i, err
+}
+
+const listActiveBanners = `-- name: ListActiveBanners :many
+SELECT banners.id, banners.title, banners.body, banners.level, banners.active, banners.dismissible, banners.created_by, banners.starts_at, banners.ends_at, banners.created_at, banners.updated_at
+FROM banners
+WHERE active
+  AND (starts_at IS NULL OR starts_at <= now())
+  AND (ends_at IS NULL OR ends_at > now())
+ORDER BY created_at DESC
+`
+
+func (q *Queries) ListActiveBanners(ctx context.Context) ([]Banner, error) {
+	rows, err := q.db.QueryContext(ctx, listActiveBanners)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	items := []Banner{}
+	for rows.Next() {
+		var i Banner
+		if err := rows.Scan(
+			&i.ID,
+			&i.Title,
+			&i.Body,
+			&i.Level,
+			&i.Active,
+			&i.Dismissible,
+			&i.CreatedBy,
+			&i.StartsAt,
+			&i.EndsAt,
+			&i.CreatedAt,
+			&i.UpdatedAt,
+		); 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 listBanners = `-- name: ListBanners :many
+SELECT banners.id, banners.title, banners.body, banners.level, banners.active, banners.dismissible, banners.created_by, banners.starts_at, banners.ends_at, banners.created_at, banners.updated_at
+FROM banners
+ORDER BY created_at DESC
+`
+
+func (q *Queries) ListBanners(ctx context.Context) ([]Banner, error) {
+	rows, err := q.db.QueryContext(ctx, listBanners)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	items := []Banner{}
+	for rows.Next() {
+		var i Banner
+		if err := rows.Scan(
+			&i.ID,
+			&i.Title,
+			&i.Body,
+			&i.Level,
+			&i.Active,
+			&i.Dismissible,
+			&i.CreatedBy,
+			&i.StartsAt,
+			&i.EndsAt,
+			&i.CreatedAt,
+			&i.UpdatedAt,
+		); 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 updateBanner = `-- name: UpdateBanner :one
+UPDATE banners
+SET title = $2,
+    body = $3,
+    level = $4,
+    active = $5,
+    dismissible = $6,
+    starts_at = $7,
+    ends_at = $8,
+    updated_at = now()
+WHERE id = $1
+RETURNING banners.id, banners.title, banners.body, banners.level, banners.active, banners.dismissible, banners.created_by, banners.starts_at, banners.ends_at, banners.created_at, banners.updated_at
+`
+
+type UpdateBannerParams struct {
+	ID          uuid.UUID    `json:"id"`
+	Title       string       `json:"title"`
+	Body        string       `json:"body"`
+	Level       string       `json:"level"`
+	Active      bool         `json:"active"`
+	Dismissible bool         `json:"dismissible"`
+	StartsAt    sql.NullTime `json:"starts_at"`
+	EndsAt      sql.NullTime `json:"ends_at"`
+}
+
+func (q *Queries) UpdateBanner(ctx context.Context, arg UpdateBannerParams) (Banner, error) {
+	row := q.db.QueryRowContext(ctx, updateBanner,
+		arg.ID,
+		arg.Title,
+		arg.Body,
+		arg.Level,
+		arg.Active,
+		arg.Dismissible,
+		arg.StartsAt,
+		arg.EndsAt,
+	)
+	var i Banner
+	err := row.Scan(
+		&i.ID,
+		&i.Title,
+		&i.Body,
+		&i.Level,
+		&i.Active,
+		&i.Dismissible,
+		&i.CreatedBy,
+		&i.StartsAt,
+		&i.EndsAt,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+	)
+	return i, err
+}

app/backend/internal/database/sqlcdb/models.go

@@ -64,6 +64,20 @@ type BackupTarget struct {
 	UpdatedAt sql.NullTime `json:"updated_at"`
 }
 
+type Banner struct {
+	ID          uuid.UUID     `json:"id"`
+	Title       string        `json:"title"`
+	Body        string        `json:"body"`
+	Level       string        `json:"level"`
+	Active      bool          `json:"active"`
+	Dismissible bool          `json:"dismissible"`
+	CreatedBy   uuid.NullUUID `json:"created_by"`
+	StartsAt    sql.NullTime  `json:"starts_at"`
+	EndsAt      sql.NullTime  `json:"ends_at"`
+	CreatedAt   sql.NullTime  `json:"created_at"`
+	UpdatedAt   sql.NullTime  `json:"updated_at"`
+}
+
 type ContainerInstance struct {
 	ID            string                `json:"id"`
 	Name          string                `json:"name"`

app/backend/internal/database/sqlcdb/querier.go

@@ -21,6 +21,7 @@ type Querier interface {
 	CreateAgent(ctx context.Context, arg CreateAgentParams) (NodeAgent, error)
 	CreateAgentAuthToken(ctx context.Context, arg CreateAgentAuthTokenParams) (AgentAuthToken, error)
 	CreateBackupTarget(ctx context.Context, arg CreateBackupTargetParams) error
+	CreateBanner(ctx context.Context, arg CreateBannerParams) (Banner, error)
 	CreateCommand(ctx context.Context, arg CreateCommandParams) (AgentCommand, error)
 	CreateContainer(ctx context.Context, arg CreateContainerParams) (ContainerInstance, error)
 	CreateDatabaseBackup(ctx context.Context, arg CreateDatabaseBackupParams) error
@@ -36,6 +37,7 @@ type Querier interface {
 	DatabaseServiceExistsByIDAndUser(ctx context.Context, arg DatabaseServiceExistsByIDAndUserParams) (bool, error)
 	DeleteAgent(ctx context.Context, id string) error
 	DeleteBackupTargetByIDAndUser(ctx context.Context, arg DeleteBackupTargetByIDAndUserParams) error
+	DeleteBanner(ctx context.Context, id uuid.UUID) error
 	DeleteDatabaseServiceByID(ctx context.Context, id string) error
 	DeleteDatabaseServiceByIDAndUser(ctx context.Context, arg DeleteDatabaseServiceByIDAndUserParams) error
 	DeleteOutboundWebhookByIDAndUser(ctx context.Context, arg DeleteOutboundWebhookByIDAndUserParams) error
@@ -46,6 +48,7 @@ type Querier interface {
 	GetAgentByHostAndIP(ctx context.Context, arg GetAgentByHostAndIPParams) (NodeAgent, error)
 	GetBackupTargetByID(ctx context.Context, id string) (BackupTarget, error)
 	GetBackupTargetByIDAndUser(ctx context.Context, arg GetBackupTargetByIDAndUserParams) (BackupTarget, error)
+	GetBannerByID(ctx context.Context, id uuid.UUID) (Banner, error)
 	GetCommandForAgent(ctx context.Context, arg GetCommandForAgentParams) (AgentCommand, error)
 	GetContainer(ctx context.Context, id string) (ContainerInstance, error)
 	GetContainerForAgent(ctx context.Context, arg GetContainerForAgentParams) (ContainerInstance, error)
@@ -63,11 +66,13 @@ type Querier interface {
 	GetUserTokenByHash(ctx context.Context, tokenHash string) (UserToken, error)
 	InsertAgentHeartbeat(ctx context.Context, arg InsertAgentHeartbeatParams) error
 	InsertProjectEnvironment(ctx context.Context, arg InsertProjectEnvironmentParams) error
+	ListActiveBanners(ctx context.Context) ([]Banner, error)
 	ListAgentAuthTokens(ctx context.Context) ([]AgentAuthToken, error)
 	ListAgentHeartbeatsSince(ctx context.Context, arg ListAgentHeartbeatsSinceParams) ([]AgentHeartbeat, error)
 	ListAgents(ctx context.Context) ([]NodeAgent, error)
 	ListAllDatabaseServices(ctx context.Context) ([]DatabaseService, error)
 	ListBackupTargetsByUser(ctx context.Context, userID string) ([]BackupTarget, error)
+	ListBanners(ctx context.Context) ([]Banner, error)
 	ListCommandsForAgent(ctx context.Context, nodeAgentID string) ([]AgentCommand, error)
 	ListContainersForAgent(ctx context.Context, nodeAgentID string) ([]ContainerInstance, error)
 	ListDatabaseBackupsByDatabaseAndUser(ctx context.Context, arg ListDatabaseBackupsByDatabaseAndUserParams) ([]DatabaseBackup, error)
@@ -106,6 +111,7 @@ type Querier interface {
 	UpdateAgent(ctx context.Context, arg UpdateAgentParams) (NodeAgent, error)
 	UpdateAgentHeartbeat(ctx context.Context, arg UpdateAgentHeartbeatParams) error
 	UpdateBackupTargetByIDAndUser(ctx context.Context, arg UpdateBackupTargetByIDAndUserParams) error
+	UpdateBanner(ctx context.Context, arg UpdateBannerParams) (Banner, error)
 	UpdateContainerStatus(ctx context.Context, arg UpdateContainerStatusParams) error
 	UpdateDatabaseServiceNameAndPlanByIDAndUser(ctx context.Context, arg UpdateDatabaseServiceNameAndPlanByIDAndUserParams) error
 	UpdateDatabaseServiceNameByIDAndUser(ctx context.Context, arg UpdateDatabaseServiceNameByIDAndUserParams) error

app/backend/internal/mcpserver/server.go

@@ -149,6 +149,12 @@ func init() {
 
 	register(spec{"containr_operations_get", "Cross-cutting operations view: active deployments, deploy queue depth, recent failures, cron runs, backups.", "GET", "/operations", nil, nil, false})
 
+	register(spec{"containr_banners_active", "List active announcement banners shown to users.", "GET", "/banners/active", nil, nil, false})
+	register(spec{"containr_banners_list", "List all announcement banners (admin).", "GET", "/admin/banners", nil, nil, false})
+	register(spec{"containr_banners_create", "Create an announcement banner (admin). Args: title, body, level (info|success|warning|error), active, dismissible, starts_at, ends_at.", "POST", "/admin/banners", nil, []string{"title", "body", "level", "active", "dismissible", "starts_at", "ends_at"}, false})
+	register(spec{"containr_banners_update", "Update an announcement banner (admin). Args: id plus fields to change.", "PATCH", "/admin/banners/{id}", []string{"id"}, []string{"title", "body", "level", "active", "dismissible", "starts_at", "ends_at"}, false})
+	register(spec{"containr_banners_delete", "Delete an announcement banner (admin). Args: id. Requires confirm=true.", "DELETE", "/admin/banners/{id}", []string{"id"}, nil, true})
+
 	// Nodes / agent tokens (admin)
 	register(spec{"containr_nodes_list", "List node agents (admin)", "GET", "/agents", nil, nil, false})
 	register(spec{"containr_nodes_get", "Get a node agent (admin)", "GET", "/agents/{id}", []string{"id"}, nil, false})