Validate render identity and daypart fallbacks

docs/internal/generatedtext.md

@@ -40,18 +40,24 @@ receive the same enforcement in this package.
 
 ## Render contexts
 
-The catalog's report-specific builders receive briefing metadata, a rich module
+The catalog's report-specific builders receive the prepared report identity, a
-snapshot, collected facts, derived facts, and the matching validated generated
+rich module snapshot, derived facts needed to order dayparts, and the matching
-text. They decode the module stanzas needed by the template and build typed
+validated generated text. They require the identity's report ID to match the
-Daily, Today, Tomorrow, or Hourly contexts. Context construction validates
+selected builder. When the optional metadata stanza is present, every shared
-metadata and periods, preserves rich module values, and uses ordered slices for
+identity field must agree with that prepared authority before context
-template iteration rather than maps.
+construction continues. Builders then decode the module stanzas needed by the
+template and build typed Daily, Today, Tomorrow, or Hourly contexts. Contexts
+expose only display-ready report values, generated prose, and module values;
+they do not expose complete collected or derived fact bundles. Ordered slices
+remain the template iteration surface rather than maps.
 
-Optional source stanzas become nil or fallback context fields. Missing required
+Optional source stanzas become nil or fallback context fields. Today also
-stanzas, type-decoding failures, invalid metadata, or a generated-text type
+computes whether its ordered dayparts contain a displayable condition so the
-that does not match the chosen handler fail before template execution. Prompt
+template can render either rows or its explicit no-details fallback. Missing
-packages, raw Promptkit output handling, and template asset lookup remain
+required stanzas, type-decoding failures, conflicting identity values, invalid
-outside this package.
+metadata, or a generated-text type that does not match the chosen handler fail
+before template execution. Prompt packages, raw Promptkit output handling, and
+template asset lookup remain outside this package.
 
 ## Verification and invariants
 

docs/internal/reporttemplate.md

@@ -28,8 +28,9 @@ failures actionable with template or partial context.
 Top-level templates decide which shared partials they invoke. The current
 partials cover daypart forecast variants, alert digest, and precipitation
 timing. Template code receives curated typed contexts rather than raw data
-packages, and it must not reimplement weather selection or generated-text
+packages or complete fact bundles, and it must not reimplement weather
-validation.
+selection or generated-text validation. Context construction rejects
+report-identity disagreements before template execution.
 
 ## Boundaries and verification
 
@@ -38,8 +39,8 @@ text, construct contexts, resolve report definitions, write state, execute
 Promptkit, or upload reports. It produces Markdown bytes for application
 orchestration to persist.
 
-Focused tests cover template lookup, rendering, partial
+Focused tests cover template lookup, rendering, partial behavior, daypart
-behavior, missing keys, and malformed context:
+fallbacks, missing keys, and malformed context:
 
 ```sh
 go test ./internal/reporttemplate

docs/templates.md

@@ -51,7 +51,9 @@ from rendering.
   schema, validator, render context, and template together. The validation and
   catalog rules are owned by [Generated Text internals](internal/generatedtext.md).
 - Use `.Modules.Dayparts` for ordered daypart output. Do not range over
-  `.Modules.DerivedDaypartSummaries`, which is a map.
+  `.Modules.DerivedDaypartSummaries`, which is a map. The Today partial uses
+  `.Modules.HasDaypartDetails` to ensure its heading has either rows or the
+  explicit no-details fallback.
 
 Minimal optional-value pattern:
 
@@ -92,7 +94,7 @@ to render the section:
 
 ## Render Context
 
-Every rendered template receives one typed context with these five top-level
+Every rendered template receives one typed context with these three top-level
 fields:
 
 | Field | Purpose |
@@ -100,12 +102,6 @@ fields:
 | `.Report` | Display labels and canonical report timing metadata. |
 | `.GeneratedText` | Validated prose supplied by Promptkit. |
 | `.Modules` | Deterministic, typed values prepared for Markdown rendering. |
-| `.Collected` | Normalized upstream facts for advanced use. |
-| `.Derived` | Shared calculated facts for advanced use. |
-
-`.Collected` and `.Derived` are available for an exceptional display need, but
-they are lower-level contracts. Keep reusable weather derivation in Go and use
-the module surface for normal template work.
 
 ### Report Metadata
 
@@ -144,8 +140,9 @@ Module pointers can be nil when their source or policy permits omission.
 
 | Module field | Available in |
 | --- | --- |
-| `.Modules.Metadata`, `.Modules.CurrentConditions`, `.Modules.HourlyForecast`, `.Modules.PrecipTiming`, `.Modules.AlertDigest`, `.Modules.SPCConvectiveOutlooks`, `.Modules.AreaForecastDiscussion`, `.Modules.SPCConvectiveDiscussion`, `.Modules.WeatherStory` | All four contexts |
+| `.Modules.CurrentConditions`, `.Modules.HourlyForecast`, `.Modules.PrecipTiming`, `.Modules.AlertDigest`, `.Modules.SPCConvectiveOutlooks`, `.Modules.AreaForecastDiscussion`, `.Modules.SPCConvectiveDiscussion`, `.Modules.WeatherStory` | All four contexts |
 | `.Modules.DerivedDailySummary`, `.Modules.DerivedDaypartSummaries`, `.Modules.Dayparts` | Daily, Today, Tomorrow |
+| `.Modules.HasDaypartDetails` | Today |
 | `.Modules.OutdoorWindows`, `.Modules.DailyPlanning` | Daily |
 | `.Modules.TodayPlanning` | Today |
 | `.Modules.TomorrowPlanning` | Tomorrow |

internal/app/prepared_report.go

@@ -7,6 +7,7 @@ import (
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/briefing"
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/collect"
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/config"
+	"gitea.maximumdirect.net/eric/weatherreporter/internal/facts"
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/generatedtext"
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/module"
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/promptinput"
@@ -18,7 +19,7 @@ import (
 // executions for one resolved report.
 type preparedReport struct {
 	resolved       report.Resolved
-	reportFacts    ReportFacts
+	derived        facts.DerivedFacts
 	moduleSnapshot module.Snapshot
 	identity       briefing.PreparedIdentity
 	sourceWarnings []weatherdata.SourceWarning
@@ -73,9 +74,9 @@ func prepareReport(req prepareReportRequest) (preparedReport, error) {
 		return preparedReport{}, &preparationError{operation: "lookup generated text catalog", err: err}
 	}
 
-	clonedFacts, err := clonePreparedValue(reportFacts)
+	clonedDerived, err := clonePreparedValue(reportFacts.Derived)
 	if err != nil {
-		return preparedReport{}, &preparationError{operation: "copy prepared report facts", err: err}
+		return preparedReport{}, &preparationError{operation: "copy prepared derived facts", err: err}
 	}
 	clonedSnapshot, err := clonePreparedValue(moduleSnapshot)
 	if err != nil {
@@ -87,7 +88,7 @@ func prepareReport(req prepareReportRequest) (preparedReport, error) {
 	}
 	prepared := preparedReport{
 		resolved:       cloneResolved(req.Resolved),
-		reportFacts:    clonedFacts,
+		derived:        clonedDerived,
 		moduleSnapshot: clonedSnapshot,
 		identity:       clonedIdentity,
 		sourceWarnings: append([]weatherdata.SourceWarning(nil), clonedIdentity.SourceWarnings...),
@@ -120,20 +121,20 @@ func (p preparedReport) sourceWarningsCopy() []weatherdata.SourceWarning {
 	return append([]weatherdata.SourceWarning(nil), p.sourceWarnings...)
 }
 
-func (p preparedReport) renderInputs() (briefing.PreparedIdentity, module.Snapshot, ReportFacts, error) {
+func (p preparedReport) renderInputs() (briefing.PreparedIdentity, module.Snapshot, facts.DerivedFacts, error) {
 	identity, err := clonePreparedValue(p.identity)
 	if err != nil {
-		return briefing.PreparedIdentity{}, module.Snapshot{}, ReportFacts{}, err
+		return briefing.PreparedIdentity{}, module.Snapshot{}, facts.DerivedFacts{}, err
 	}
 	snapshot, err := clonePreparedValue(p.moduleSnapshot)
 	if err != nil {
-		return briefing.PreparedIdentity{}, module.Snapshot{}, ReportFacts{}, err
+		return briefing.PreparedIdentity{}, module.Snapshot{}, facts.DerivedFacts{}, err
 	}
-	reportFacts, err := clonePreparedValue(p.reportFacts)
+	derived, err := clonePreparedValue(p.derived)
 	if err != nil {
-		return briefing.PreparedIdentity{}, module.Snapshot{}, ReportFacts{}, err
+		return briefing.PreparedIdentity{}, module.Snapshot{}, facts.DerivedFacts{}, err
 	}
-	return identity, snapshot, reportFacts, nil
+	return identity, snapshot, derived, nil
 }
 
 func clonePreparedValue[T any](value T) (T, error) {

internal/app/prepared_report_test.go

@@ -37,14 +37,15 @@ func TestPrepareReportBuildsImmutableDeterministicInputs(t *testing.T) {
 
 	originalDataPackage := append([]byte(nil), prepared.dataPackage...)
 	originalIdentity := prepared.identity
+	originalDerived := prepared.derived
 	originalWarnings := append([]weatherdata.SourceWarning(nil), prepared.sourceWarnings...)
-	identity, snapshot, reportFacts, err := prepared.renderInputs()
+	identity, snapshot, derived, err := prepared.renderInputs()
 	if err != nil {
 		t.Fatalf("renderInputs() error = %v", err)
 	}
 	identity.SourceWarnings = append(identity.SourceWarnings, weatherdata.SourceWarning{Source: "test", Message: "consumer mutation"})
 	snapshot.Outputs = nil
-	reportFacts.Collected.Hourly.Periods[0].TextDescription = "consumer mutation"
+	derived.PrecipTiming.ThunderMentioned = false
 	bundle.Hourly.Periods[0].TextDescription = "mutated after preparation"
 	bundle.Warnings = append(bundle.Warnings, weatherdata.SourceWarning{Source: "test", Message: "mutated warning"})
 	if len(bundle.Sources) > 0 {
@@ -54,13 +55,10 @@ func TestPrepareReportBuildsImmutableDeterministicInputs(t *testing.T) {
 		bundle.Sources[0].Query["mutated"] = "true"
 	}
 
-	if !bytes.Equal(prepared.dataPackage, originalDataPackage) || !reflect.DeepEqual(prepared.identity, originalIdentity) || !reflect.DeepEqual(prepared.sourceWarnings, originalWarnings) {
+	if !bytes.Equal(prepared.dataPackage, originalDataPackage) || !reflect.DeepEqual(prepared.identity, originalIdentity) || !reflect.DeepEqual(prepared.derived, originalDerived) || !reflect.DeepEqual(prepared.sourceWarnings, originalWarnings) {
 		t.Fatalf("prepared values changed after caller mutation: %#v", prepared)
 	}
-	if prepared.reportFacts.Collected.Hourly.Periods[0].TextDescription == "mutated after preparation" {
+	if len(prepared.moduleSnapshot.Outputs) == 0 {
-		t.Fatal("prepared report facts retain caller-owned weather data")
-	}
-	if prepared.reportFacts.Collected.Hourly.Periods[0].TextDescription == "consumer mutation" || len(prepared.moduleSnapshot.Outputs) == 0 {
 		t.Fatal("prepared report values retain consumer mutation")
 	}
 }

internal/app/profile_execution.go

@@ -115,11 +115,11 @@ func executePreparedProfile(ctx context.Context, req profileExecutionRequest) (p
 	if err != nil {
 		return outcome, nil, &profileExecutionError{operation: "validate generated text", err: err}
 	}
-	identity, snapshot, reportFacts, err := req.Prepared.renderInputs()
+	identity, snapshot, derived, err := req.Prepared.renderInputs()
 	if err != nil {
 		return outcome, nil, &profileExecutionError{operation: "copy prepared render inputs", err: err}
 	}
-	renderContext, err := req.Prepared.handler.BuildRenderContext(identity, snapshot, reportFacts.Collected, reportFacts.Derived, generatedText)
+	renderContext, err := req.Prepared.handler.BuildRenderContext(identity, snapshot, derived, generatedText)
 	if err != nil {
 		return outcome, nil, &profileExecutionError{operation: "build render context", err: err}
 	}

internal/generatedtext/catalog.go

@@ -25,7 +25,7 @@ const (
 
 type validator func([]byte) (any, []byte, error)
 
-type renderContextBuilder func(report.ID, string, briefing.PreparedIdentity, module.Snapshot, facts.CollectedFacts, facts.DerivedFacts, any) (any, error)
+type renderContextBuilder func(report.ID, string, briefing.PreparedIdentity, module.Snapshot, facts.DerivedFacts, any) (any, error)
 
 type catalogEntry struct {
 	reportID             report.ID
@@ -140,11 +140,11 @@ func (h Handler) Validate(data []byte) (any, []byte, error) {
 	return h.validate(data)
 }
 
-func (h Handler) BuildRenderContext(identity briefing.PreparedIdentity, snapshot module.Snapshot, collected facts.CollectedFacts, derived facts.DerivedFacts, generated any) (any, error) {
+func (h Handler) BuildRenderContext(identity briefing.PreparedIdentity, snapshot module.Snapshot, derived facts.DerivedFacts, generated any) (any, error) {
 	if h.renderContextBuilder == nil {
 		return nil, fmt.Errorf("render-context builder is not registered for template %q on report %q", h.templateID, h.reportID)
 	}
-	return h.renderContextBuilder(h.reportID, h.templateID, identity, snapshot, collected, derived, generated)
+	return h.renderContextBuilder(h.reportID, h.templateID, identity, snapshot, derived, generated)
 }
 
 func (h Handler) Render(data any) ([]byte, error) {
@@ -171,34 +171,34 @@ func validateTomorrow(data []byte) (any, []byte, error) {
 	return ValidateTomorrow(data)
 }
 
-func buildHourlyContext(reportID report.ID, templateID string, identity briefing.PreparedIdentity, snapshot module.Snapshot, collected facts.CollectedFacts, derived facts.DerivedFacts, generated any) (any, error) {
+func buildHourlyContext(reportID report.ID, templateID string, identity briefing.PreparedIdentity, snapshot module.Snapshot, _ facts.DerivedFacts, generated any) (any, error) {
 	hourly, ok := generated.(Hourly)
 	if !ok {
 		return nil, fmt.Errorf("report template %q requires hourly generated text for report %q", templateID, reportID)
 	}
-	return BuildHourlyRenderContext(identity, snapshot, hourly, collected, derived)
+	return BuildHourlyRenderContext(identity, snapshot, hourly)
 }
 
-func buildDailyContext(reportID report.ID, templateID string, identity briefing.PreparedIdentity, snapshot module.Snapshot, collected facts.CollectedFacts, derived facts.DerivedFacts, generated any) (any, error) {
+func buildDailyContext(reportID report.ID, templateID string, identity briefing.PreparedIdentity, snapshot module.Snapshot, derived facts.DerivedFacts, generated any) (any, error) {
 	daily, ok := generated.(Daily)
 	if !ok {
 		return nil, fmt.Errorf("report template %q requires daily generated text for report %q", templateID, reportID)
 	}
-	return BuildDailyRenderContext(identity, snapshot, daily, collected, derived)
+	return BuildDailyRenderContext(identity, snapshot, daily, derived)
 }
 
-func buildTodayContext(reportID report.ID, templateID string, identity briefing.PreparedIdentity, snapshot module.Snapshot, collected facts.CollectedFacts, derived facts.DerivedFacts, generated any) (any, error) {
+func buildTodayContext(reportID report.ID, templateID string, identity briefing.PreparedIdentity, snapshot module.Snapshot, derived facts.DerivedFacts, generated any) (any, error) {
 	today, ok := generated.(Today)
 	if !ok {
 		return nil, fmt.Errorf("report template %q requires today generated text for report %q", templateID, reportID)
 	}
-	return BuildTodayRenderContext(identity, snapshot, today, collected, derived)
+	return BuildTodayRenderContext(identity, snapshot, today, derived)
 }
 
-func buildTomorrowContext(reportID report.ID, templateID string, identity briefing.PreparedIdentity, snapshot module.Snapshot, collected facts.CollectedFacts, derived facts.DerivedFacts, generated any) (any, error) {
+func buildTomorrowContext(reportID report.ID, templateID string, identity briefing.PreparedIdentity, snapshot module.Snapshot, derived facts.DerivedFacts, generated any) (any, error) {
 	tomorrow, ok := generated.(Tomorrow)
 	if !ok {
 		return nil, fmt.Errorf("report template %q requires tomorrow generated text for report %q", templateID, reportID)
 	}
-	return BuildTomorrowRenderContext(identity, snapshot, tomorrow, collected, derived)
+	return BuildTomorrowRenderContext(identity, snapshot, tomorrow, derived)
 }

internal/generatedtext/catalog_test.go

@@ -275,7 +275,7 @@ func TestCatalogBuildRenderContextRejectsMismatchedGeneratedText(t *testing.T) {
 	if err != nil {
 		t.Fatalf("LookupDefinition(hourly) error = %v", err)
 	}
-	_, err = hourlyHandler.BuildRenderContext(testMetadata(), testSnapshot(t), testCollected(), testDerived(), Tomorrow{
+	_, err = hourlyHandler.BuildRenderContext(testMetadata(), testSnapshot(t), testDerived(), Tomorrow{
 		Summary:            "Storms become more likely tomorrow.",
 		ForecastDiscussion: []string{"A front will keep showers in the forecast."},
 	})
@@ -290,7 +290,7 @@ func TestCatalogBuildRenderContextRejectsMismatchedGeneratedText(t *testing.T) {
 	if err != nil {
 		t.Fatalf("LookupDefinition(tomorrow) error = %v", err)
 	}
-	_, err = tomorrowHandler.BuildRenderContext(testTomorrowMetadata(), testTomorrowSnapshot(t), testCollected(), testTomorrowDerived(), Hourly{
+	_, err = tomorrowHandler.BuildRenderContext(testTomorrowMetadata(), testTomorrowSnapshot(t), testTomorrowDerived(), Hourly{
 		Summary:            "Storm chances increase.",
 		ForecastDiscussion: "A front will keep showers in the forecast.",
 	})
@@ -309,7 +309,7 @@ func TestCatalogBuildRenderContextRejectsMismatchedGeneratedText(t *testing.T) {
 	if err != nil {
 		t.Fatalf("LookupDefinition(today) error = %v", err)
 	}
-	_, err = todayHandler.BuildRenderContext(testTodayMetadata(), testTodaySnapshot(t), testCollected(), testTodayDerived(), Tomorrow{
+	_, err = todayHandler.BuildRenderContext(testTodayMetadata(), testTodaySnapshot(t), testTodayDerived(), Tomorrow{
 		Summary:            "Storms become more likely tomorrow.",
 		ForecastDiscussion: []string{"A front will keep showers in the forecast."},
 	})
@@ -328,7 +328,7 @@ func TestCatalogBuildRenderContextRejectsMismatchedGeneratedText(t *testing.T) {
 	if err != nil {
 		t.Fatalf("LookupDefinition(daily) error = %v", err)
 	}
-	_, err = dailyHandler.BuildRenderContext(testDailyMetadata(), testDailySnapshot(t), testCollected(), testDailyDerived(), Tomorrow{
+	_, err = dailyHandler.BuildRenderContext(testDailyMetadata(), testDailySnapshot(t), testDailyDerived(), Tomorrow{
 		Summary:            "Storms become more likely tomorrow.",
 		ForecastDiscussion: []string{"A front will keep showers in the forecast."},
 	})
@@ -349,7 +349,7 @@ func TestCatalogBuildRenderContextSupportsDaily(t *testing.T) {
 	if err != nil {
 		t.Fatalf("LookupDefinition(daily) error = %v", err)
 	}
-	ctx, err := handler.BuildRenderContext(testDailyMetadata(), testDailySnapshot(t), testCollected(), testDailyDerived(), Daily{
+	ctx, err := handler.BuildRenderContext(testDailyMetadata(), testDailySnapshot(t), testDailyDerived(), Daily{
 		Summary:            "Showers are possible during the selected day.",
 		ForecastDiscussion: []string{"A front will keep rain chances in the forecast."},
 	})

internal/generatedtext/render_context.go

@@ -2,6 +2,7 @@ package generatedtext
 
 import (
 	"fmt"
+	"reflect"
 	"sort"
 	"time"
 
@@ -9,6 +10,7 @@ import (
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/facts"
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/forecast"
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/module"
+	"gitea.maximumdirect.net/eric/weatherreporter/internal/report"
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/timeutil"
 )
 
@@ -16,8 +18,6 @@ type HourlyRenderContext struct {
 	Report        HourlyReportContext
 	GeneratedText Hourly
 	Modules       HourlyTemplateModules
-	Collected     facts.CollectedFacts
-	Derived       facts.DerivedFacts
 }
 
 type HourlyReportContext struct {
@@ -31,7 +31,6 @@ type HourlyReportContext struct {
 }
 
 type HourlyTemplateModules struct {
-	Metadata                *briefing.MetadataModule
 	CurrentConditions       *briefing.CurrentConditionsModule
 	HourlyForecast          *briefing.HourlyForecastModule
 	PrecipTiming            *briefing.PrecipTimingModule
@@ -46,24 +45,18 @@ type TomorrowRenderContext struct {
 	Report        TomorrowReportContext
 	GeneratedText Tomorrow
 	Modules       TomorrowTemplateModules
-	Collected     facts.CollectedFacts
-	Derived       facts.DerivedFacts
 }
 
 type DailyRenderContext struct {
 	Report        DailyReportContext
 	GeneratedText Daily
 	Modules       DailyTemplateModules
-	Collected     facts.CollectedFacts
-	Derived       facts.DerivedFacts
 }
 
 type TodayRenderContext struct {
 	Report        TodayReportContext
 	GeneratedText Today
 	Modules       TodayTemplateModules
-	Collected     facts.CollectedFacts
-	Derived       facts.DerivedFacts
 }
 
 type TodayReportContext struct {
@@ -78,12 +71,12 @@ type TodayReportContext struct {
 }
 
 type TodayTemplateModules struct {
-	Metadata                *briefing.MetadataModule
 	CurrentConditions       *briefing.CurrentConditionsModule
 	HourlyForecast          *briefing.HourlyForecastModule
 	DerivedDailySummary     *briefing.DerivedDailySummaryModule
 	DerivedDaypartSummaries *map[string]briefing.DerivedDaypartSummaryModule
 	Dayparts                []TodayDaypartContext
+	HasDaypartDetails       bool
 	PrecipTiming            *briefing.PrecipTimingModule
 	AlertDigest             *briefing.AlertDigestModule
 	SPCConvectiveOutlooks   *briefing.SPCConvectiveOutlooksModule
@@ -110,7 +103,6 @@ type TomorrowReportContext struct {
 }
 
 type TomorrowTemplateModules struct {
-	Metadata                *briefing.MetadataModule
 	CurrentConditions       *briefing.CurrentConditionsModule
 	HourlyForecast          *briefing.HourlyForecastModule
 	DerivedDailySummary     *briefing.DerivedDailySummaryModule
@@ -142,7 +134,6 @@ type DailyReportContext struct {
 }
 
 type DailyTemplateModules struct {
-	Metadata                *briefing.MetadataModule
 	CurrentConditions       *briefing.CurrentConditionsModule
 	HourlyForecast          *briefing.HourlyForecastModule
 	DerivedDailySummary     *briefing.DerivedDailySummaryModule
@@ -175,7 +166,6 @@ type dayStyleReportContext struct {
 }
 
 type dayStyleTemplateModules struct {
-	Metadata                *briefing.MetadataModule
 	CurrentConditions       *briefing.CurrentConditionsModule
 	HourlyForecast          *briefing.HourlyForecastModule
 	DerivedDailySummary     *briefing.DerivedDailySummaryModule
@@ -188,7 +178,10 @@ type dayStyleTemplateModules struct {
 	WeatherStory            *briefing.WeatherStoryModule
 }
 
-func BuildHourlyRenderContext(identity briefing.PreparedIdentity, snapshot module.Snapshot, generated Hourly, collected facts.CollectedFacts, derived facts.DerivedFacts) (HourlyRenderContext, error) {
+func BuildHourlyRenderContext(identity briefing.PreparedIdentity, snapshot module.Snapshot, generated Hourly) (HourlyRenderContext, error) {
+	if err := validateRenderIdentity(report.Hourly, identity, snapshot); err != nil {
+		return HourlyRenderContext{}, err
+	}
 	location, err := timeutil.LoadLocation(identity.Timezone)
 	if err != nil {
 		return HourlyRenderContext{}, fmt.Errorf("build hourly render context: %w", err)
@@ -215,12 +208,13 @@ func BuildHourlyRenderContext(identity briefing.PreparedIdentity, snapshot modul
 		},
 		GeneratedText: generated,
 		Modules:       modules,
-		Collected:     collected,
-		Derived:       derived,
 	}, nil
 }
 
-func BuildDailyRenderContext(identity briefing.PreparedIdentity, snapshot module.Snapshot, generated Daily, collected facts.CollectedFacts, derived facts.DerivedFacts) (DailyRenderContext, error) {
+func BuildDailyRenderContext(identity briefing.PreparedIdentity, snapshot module.Snapshot, generated Daily, derived facts.DerivedFacts) (DailyRenderContext, error) {
+	if err := validateRenderIdentity(report.Daily, identity, snapshot); err != nil {
+		return DailyRenderContext{}, err
+	}
 	reportContext, err := buildDayStyleReportContext(identity, "daily", func(dayName string) string {
 		return dayName + "'s Weather"
 	})
@@ -235,12 +229,13 @@ func BuildDailyRenderContext(identity briefing.PreparedIdentity, snapshot module
 		Report:        reportContext.dailyReportContext(),
 		GeneratedText: generated,
 		Modules:       modules,
-		Collected:     collected,
-		Derived:       derived,
 	}, nil
 }
 
-func BuildTodayRenderContext(identity briefing.PreparedIdentity, snapshot module.Snapshot, generated Today, collected facts.CollectedFacts, derived facts.DerivedFacts) (TodayRenderContext, error) {
+func BuildTodayRenderContext(identity briefing.PreparedIdentity, snapshot module.Snapshot, generated Today, derived facts.DerivedFacts) (TodayRenderContext, error) {
+	if err := validateRenderIdentity(report.Today, identity, snapshot); err != nil {
+		return TodayRenderContext{}, err
+	}
 	reportContext, err := buildDayStyleReportContext(identity, "today", func(string) string {
 		return "Today's Weather"
 	})
@@ -255,12 +250,13 @@ func BuildTodayRenderContext(identity briefing.PreparedIdentity, snapshot module
 		Report:        reportContext.todayReportContext(),
 		GeneratedText: generated,
 		Modules:       modules,
-		Collected:     collected,
-		Derived:       derived,
 	}, nil
 }
 
-func BuildTomorrowRenderContext(identity briefing.PreparedIdentity, snapshot module.Snapshot, generated Tomorrow, collected facts.CollectedFacts, derived facts.DerivedFacts) (TomorrowRenderContext, error) {
+func BuildTomorrowRenderContext(identity briefing.PreparedIdentity, snapshot module.Snapshot, generated Tomorrow, derived facts.DerivedFacts) (TomorrowRenderContext, error) {
+	if err := validateRenderIdentity(report.Tomorrow, identity, snapshot); err != nil {
+		return TomorrowRenderContext{}, err
+	}
 	reportContext, err := buildDayStyleReportContext(identity, "tomorrow", func(dayName string) string {
 		return dayName + "'s Weather"
 	})
@@ -275,11 +271,36 @@ func BuildTomorrowRenderContext(identity briefing.PreparedIdentity, snapshot mod
 		Report:        reportContext.tomorrowReportContext(),
 		GeneratedText: generated,
 		Modules:       modules,
-		Collected:     collected,
-		Derived:       derived,
 	}, nil
 }
 
+func validateRenderIdentity(expected report.ID, identity briefing.PreparedIdentity, snapshot module.Snapshot) error {
+	if identity.ReportID != expected {
+		return fmt.Errorf("render identity report %q does not match expected report %q", identity.ReportID, expected)
+	}
+	metadata, found, err := module.StanzaValue[briefing.MetadataModule](snapshot, string(module.Metadata))
+	if err != nil {
+		return fmt.Errorf("read metadata module for report %q: %w", expected, err)
+	}
+	if !found || metadataMatchesIdentity(metadata, identity) {
+		return nil
+	}
+	return fmt.Errorf("metadata module does not match render identity for report %q", expected)
+}
+
+func metadataMatchesIdentity(metadata briefing.MetadataModule, identity briefing.PreparedIdentity) bool {
+	if metadata.RunID != identity.RunID || metadata.ReportID != identity.ReportID || metadata.Variant != identity.Variant || metadata.PromptID != identity.PromptID || !metadata.GeneratedAt.Equal(identity.GeneratedAt) || metadata.Units != identity.Units || metadata.Timezone != identity.Timezone || metadata.ValidPeriod != identity.ValidPeriod || !reflect.DeepEqual(metadata.Location, identity.Location) || len(metadata.SourceWarnings) != len(identity.SourceWarnings) {
+		return false
+	}
+	for index, warning := range identity.SourceWarnings {
+		summary := metadata.SourceWarnings[index]
+		if summary.Source != warning.Source || summary.Code != warning.Code || summary.Severity != warning.Severity || summary.Message != warning.Message || summary.CompletenessImpact != warning.CompletenessImpact {
+			return false
+		}
+	}
+	return true
+}
+
 func buildDayStyleReportContext(identity briefing.PreparedIdentity, name string, title func(string) string) (dayStyleReportContext, error) {
 	location, err := timeutil.LoadLocation(identity.Timezone)
 	if err != nil {
@@ -359,7 +380,6 @@ func dailyTemplateModules(snapshot module.Snapshot, derived facts.DerivedFacts)
 		return DailyTemplateModules{}, err
 	}
 	return DailyTemplateModules{
-		Metadata:                common.Metadata,
 		CurrentConditions:       common.CurrentConditions,
 		HourlyForecast:          common.HourlyForecast,
 		DerivedDailySummary:     common.DerivedDailySummary,
@@ -385,13 +405,14 @@ func todayTemplateModules(snapshot module.Snapshot, derived facts.DerivedFacts)
 	if err != nil {
 		return TodayTemplateModules{}, err
 	}
+	dayparts := orderedTodayDayparts(common.DerivedDaypartSummaries, derived.DaypartSummaries)
 	return TodayTemplateModules{
-		Metadata:                common.Metadata,
 		CurrentConditions:       common.CurrentConditions,
 		HourlyForecast:          common.HourlyForecast,
 		DerivedDailySummary:     common.DerivedDailySummary,
 		DerivedDaypartSummaries: common.DerivedDaypartSummaries,
-		Dayparts:                orderedTodayDayparts(common.DerivedDaypartSummaries, derived.DaypartSummaries),
+		Dayparts:                dayparts,
+		HasDaypartDetails:       hasTodayDaypartDetails(dayparts),
 		PrecipTiming:            common.PrecipTiming,
 		AlertDigest:             common.AlertDigest,
 		SPCConvectiveOutlooks:   common.SPCConvectiveOutlooks,
@@ -404,10 +425,6 @@ func todayTemplateModules(snapshot module.Snapshot, derived facts.DerivedFacts)
 
 func hourlyTemplateModules(snapshot module.Snapshot) (HourlyTemplateModules, error) {
 	lookup := newModuleSnapshotLookup(snapshot)
-	metadata, err := lookup.metadata()
-	if err != nil {
-		return HourlyTemplateModules{}, err
-	}
 	current, err := lookup.currentConditions()
 	if err != nil {
 		return HourlyTemplateModules{}, err
@@ -441,7 +458,6 @@ func hourlyTemplateModules(snapshot module.Snapshot) (HourlyTemplateModules, err
 		return HourlyTemplateModules{}, err
 	}
 	return HourlyTemplateModules{
-		Metadata:                metadata,
 		CurrentConditions:       current,
 		HourlyForecast:          hourly,
 		PrecipTiming:            precip,
@@ -463,7 +479,6 @@ func tomorrowTemplateModules(snapshot module.Snapshot, derived facts.DerivedFact
 		return TomorrowTemplateModules{}, err
 	}
 	return TomorrowTemplateModules{
-		Metadata:                common.Metadata,
 		CurrentConditions:       common.CurrentConditions,
 		HourlyForecast:          common.HourlyForecast,
 		DerivedDailySummary:     common.DerivedDailySummary,
@@ -481,10 +496,6 @@ func tomorrowTemplateModules(snapshot module.Snapshot, derived facts.DerivedFact
 
 func dayStyleTemplateModuleSnapshot(snapshot module.Snapshot) (dayStyleTemplateModules, moduleSnapshotLookup, error) {
 	lookup := newModuleSnapshotLookup(snapshot)
-	metadata, err := lookup.metadata()
-	if err != nil {
-		return dayStyleTemplateModules{}, moduleSnapshotLookup{}, err
-	}
 	current, err := lookup.currentConditions()
 	if err != nil {
 		return dayStyleTemplateModules{}, moduleSnapshotLookup{}, err
@@ -526,7 +537,6 @@ func dayStyleTemplateModuleSnapshot(snapshot module.Snapshot) (dayStyleTemplateM
 		return dayStyleTemplateModules{}, moduleSnapshotLookup{}, err
 	}
 	return dayStyleTemplateModules{
-		Metadata:                metadata,
 		CurrentConditions:       current,
 		HourlyForecast:          hourly,
 		DerivedDailySummary:     daily,
@@ -556,10 +566,6 @@ func newModuleSnapshotLookup(snapshot module.Snapshot) moduleSnapshotLookup {
 	}
 }
 
-func (lookup moduleSnapshotLookup) metadata() (*briefing.MetadataModule, error) {
-	return optionalStanza[briefing.MetadataModule](lookup, module.Metadata)
-}
-
 func (lookup moduleSnapshotLookup) currentConditions() (*briefing.CurrentConditionsModule, error) {
 	return optionalStanza[briefing.CurrentConditionsModule](lookup, module.CurrentConditions)
 }
@@ -638,6 +644,15 @@ func orderedTodayDayparts(dayparts *map[string]briefing.DerivedDaypartSummaryMod
 	return out
 }
 
+func hasTodayDaypartDetails(dayparts []TodayDaypartContext) bool {
+	for _, daypart := range dayparts {
+		if daypart.Summary.DominantConditionDisplay != "" || daypart.Summary.DominantCondition != "" {
+			return true
+		}
+	}
+	return false
+}
+
 func orderedDailyDayparts(dayparts *map[string]briefing.DerivedDaypartSummaryModule, ordered []forecast.DaypartSummary) []DailyDaypartContext {
 	orderedRows := orderedDaypartRows(dayparts, ordered)
 	out := make([]DailyDaypartContext, 0, len(orderedRows))

internal/generatedtext/render_context_test.go

@@ -22,9 +22,7 @@ func TestBuildHourlyRenderContext(t *testing.T) {
 		ForecastDiscussion:  "A front will keep the region unsettled.",
 		PrecipitationTiming: "A cold front is moving into the region.",
 	}
-	collected := testCollected()
+	ctx, err := BuildHourlyRenderContext(metadata, snapshot, generated)
-	derived := testDerived()
-	ctx, err := BuildHourlyRenderContext(metadata, snapshot, generated, collected, derived)
 	if err != nil {
 		t.Fatalf("BuildHourlyRenderContext() error = %v", err)
 	}
@@ -73,13 +71,6 @@ func TestBuildHourlyRenderContext(t *testing.T) {
 	if ctx.Modules.WeatherStory == nil || ctx.Modules.WeatherStory.Title != "Morning storms" {
 		t.Fatalf("Modules.WeatherStory = %#v, want story", ctx.Modules.WeatherStory)
 	}
-	if !ctx.Collected.FetchedAt.Equal(collected.FetchedAt) {
-		t.Fatalf("Collected.FetchedAt = %s, want %s", ctx.Collected.FetchedAt, collected.FetchedAt)
-	}
-	if !ctx.Derived.PrecipTiming.ThunderMentioned {
-		t.Fatalf("Derived.PrecipTiming.ThunderMentioned = false, want true")
-	}
-
 	rendered, err := reporttemplate.Render("hourly", ctx)
 	if err != nil {
 		t.Fatalf("Render() error = %v", err)
@@ -113,7 +104,7 @@ func TestBuildHourlyRenderContextAllowsOmittedOptionalModules(t *testing.T) {
 	ctx, err := BuildHourlyRenderContext(testMetadata(), snapshot, Hourly{
 		Summary:            "Storm chances increase.",
 		ForecastDiscussion: "A front will keep the region unsettled.",
-	}, testCollected(), facts.DerivedFacts{})
+	})
 	if err != nil {
 		t.Fatalf("BuildHourlyRenderContext() error = %v", err)
 	}
@@ -135,7 +126,7 @@ func TestBuildRenderContextReportsModuleExtractionError(t *testing.T) {
 	_, err = BuildHourlyRenderContext(testMetadata(), snapshot, Hourly{
 		Summary:            "Storm chances increase.",
 		ForecastDiscussion: "A front will keep the region unsettled.",
-	}, testCollected(), facts.DerivedFacts{})
+	})
 	if err == nil {
 		t.Fatal("BuildHourlyRenderContext() error = nil, want extraction error")
 	}
@@ -144,6 +135,83 @@ func TestBuildRenderContextReportsModuleExtractionError(t *testing.T) {
 	}
 }
 
+func TestRenderContextsRejectConflictingIdentity(t *testing.T) {
+	tests := []struct {
+		name  string
+		build func() error
+	}{
+		{
+			name: "hourly",
+			build: func() error {
+				identity := testMetadata()
+				identity.ReportID = report.Daily
+				_, err := BuildHourlyRenderContext(identity, testSnapshot(t), Hourly{})
+				return err
+			},
+		},
+		{
+			name: "daily",
+			build: func() error {
+				identity := testDailyMetadata()
+				identity.ReportID = report.Today
+				_, err := BuildDailyRenderContext(identity, testDailySnapshot(t), Daily{}, testDailyDerived())
+				return err
+			},
+		},
+		{
+			name: "today",
+			build: func() error {
+				identity := testTodayMetadata()
+				identity.ReportID = report.Tomorrow
+				_, err := BuildTodayRenderContext(identity, testTodaySnapshot(t), Today{}, testTodayDerived())
+				return err
+			},
+		},
+		{
+			name: "tomorrow",
+			build: func() error {
+				identity := testTomorrowMetadata()
+				identity.ReportID = report.Hourly
+				_, err := BuildTomorrowRenderContext(identity, testTomorrowSnapshot(t), Tomorrow{}, testTomorrowDerived())
+				return err
+			},
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			err := test.build()
+			if err == nil {
+				t.Fatal("render context error = nil, want conflicting identity rejection")
+			}
+			if !strings.Contains(err.Error(), "render identity report") {
+				t.Fatalf("render context error = %v, want identity mismatch", err)
+			}
+		})
+	}
+}
+
+func TestRenderContextRejectsMetadataModuleMismatch(t *testing.T) {
+	identity := testTodayMetadata()
+	snapshot := testTodaySnapshot(t)
+	for index := range snapshot.Outputs {
+		if snapshot.Outputs[index].ID != module.Metadata {
+			continue
+		}
+		metadata := snapshot.Outputs[index].Value.(briefing.MetadataModule)
+		metadata.PromptID = "weather.daily_generated_text"
+		snapshot.Outputs[index].Value = metadata
+	}
+
+	_, err := BuildTodayRenderContext(identity, snapshot, Today{}, testTodayDerived())
+	if err == nil {
+		t.Fatal("BuildTodayRenderContext() error = nil, want metadata module mismatch")
+	}
+	if !strings.Contains(err.Error(), "metadata module does not match render identity") {
+		t.Fatalf("BuildTodayRenderContext() error = %v, want metadata mismatch", err)
+	}
+}
+
 func TestBuildTodayRenderContext(t *testing.T) {
 	metadata := testTodayMetadata()
 	snapshot := testTodaySnapshot(t)
@@ -155,10 +223,9 @@ func TestBuildTodayRenderContext(t *testing.T) {
 		},
 		PrecipitationTiming: "The most likely rain window is from midafternoon into early evening.",
 	}
-	collected := testCollected()
 	derived := testTodayDerived()
 
-	ctx, err := BuildTodayRenderContext(metadata, snapshot, generated, collected, derived)
+	ctx, err := BuildTodayRenderContext(metadata, snapshot, generated, derived)
 	if err != nil {
 		t.Fatalf("BuildTodayRenderContext() error = %v", err)
 	}
@@ -171,9 +238,6 @@ func TestBuildTodayRenderContext(t *testing.T) {
 	if ctx.Report.GeneratedAtLabel != "Monday, June 15, 2026 at 7:14 AM" {
 		t.Fatalf("Report.GeneratedAtLabel = %q, want friendly generated-at label", ctx.Report.GeneratedAtLabel)
 	}
-	if ctx.Modules.Metadata == nil || ctx.Modules.Metadata.ReportID != report.Today {
-		t.Fatalf("Modules.Metadata = %#v, want today metadata", ctx.Modules.Metadata)
-	}
 	if ctx.Modules.CurrentConditions == nil || ctx.Modules.HourlyForecast == nil {
 		t.Fatalf("current/hourly modules = %#v/%#v, want available in render context", ctx.Modules.CurrentConditions, ctx.Modules.HourlyForecast)
 	}
@@ -186,6 +250,9 @@ func TestBuildTodayRenderContext(t *testing.T) {
 	if len(ctx.Modules.Dayparts) != 2 || ctx.Modules.Dayparts[0].Key != "morning" || ctx.Modules.Dayparts[1].Key != "afternoon" {
 		t.Fatalf("Modules.Dayparts = %#v, want configured order", ctx.Modules.Dayparts)
 	}
+	if !ctx.Modules.HasDaypartDetails {
+		t.Fatal("Modules.HasDaypartDetails = false, want displayable dayparts")
+	}
 	if morning := (*ctx.Modules.DerivedDaypartSummaries)["morning"]; morning.DominantConditionDisplay == "" || morning.DominantConditionLower == "" || morning.TemperatureSteadyPhraseF == "" {
 		t.Fatalf("today rich morning daypart helpers = %#v, want render-context helper fields", morning)
 	}
@@ -201,13 +268,6 @@ func TestBuildTodayRenderContext(t *testing.T) {
 	if ctx.Modules.TodayPlanning.MorningReadiness[0] != "Take sunglasses early." {
 		t.Fatalf("Modules.TodayPlanning = %#v, want today planning facts", ctx.Modules.TodayPlanning)
 	}
-	if !ctx.Collected.FetchedAt.Equal(collected.FetchedAt) {
-		t.Fatalf("Collected.FetchedAt = %s, want %s", ctx.Collected.FetchedAt, collected.FetchedAt)
-	}
-	if len(ctx.Derived.DaypartSummaries) != 2 {
-		t.Fatalf("Derived.DaypartSummaries = %#v, want passthrough facts", ctx.Derived.DaypartSummaries)
-	}
-
 	rendered, err := reporttemplate.Render("today", ctx)
 	if err != nil {
 		t.Fatalf("Render() error = %v", err)
@@ -260,7 +320,7 @@ func TestTodayRenderContextPreservesUnicodeDaypartDisplayNames(t *testing.T) {
 	ctx, err := BuildTodayRenderContext(metadata, snapshot, Today{
 		Summary:            "Today summary.",
 		ForecastDiscussion: []string{"Morning conditions stay quiet."},
-	}, testCollected(), testTodayDerived())
+	}, testTodayDerived())
 	if err != nil {
 		t.Fatalf("BuildTodayRenderContext() error = %v", err)
 	}
@@ -281,13 +341,16 @@ func TestBuildTodayRenderContextAllowsOmittedOptionalModules(t *testing.T) {
 	ctx, err := BuildTodayRenderContext(testTodayMetadata(), snapshot, Today{
 		Summary:            "Dry weather is expected today.",
 		ForecastDiscussion: []string{"High pressure keeps conditions quiet."},
-	}, testCollected(), facts.DerivedFacts{})
+	}, facts.DerivedFacts{})
 	if err != nil {
 		t.Fatalf("BuildTodayRenderContext() error = %v", err)
 	}
-	if ctx.Modules.Metadata != nil || ctx.Modules.CurrentConditions != nil || ctx.Modules.PrecipTiming != nil || len(ctx.Modules.Dayparts) != 0 || ctx.Modules.TodayPlanning != nil {
+	if ctx.Modules.CurrentConditions != nil || ctx.Modules.PrecipTiming != nil || len(ctx.Modules.Dayparts) != 0 || ctx.Modules.TodayPlanning != nil {
 		t.Fatalf("Modules = %#v, want omitted optional modules", ctx.Modules)
 	}
+	if ctx.Modules.HasDaypartDetails {
+		t.Fatal("Modules.HasDaypartDetails = true, want no displayable dayparts")
+	}
 	rendered, err := reporttemplate.Render("today", ctx)
 	if err != nil {
 		t.Fatalf("Render() error = %v", err)
@@ -310,7 +373,6 @@ func TestBuildDayStyleRenderContextsPopulateSharedFieldsAndPlanningModules(t *te
 		generatedAtLabel  string
 		timezone          string
 		validPeriod       timeutil.Period
-		metadata          bool
 		current           bool
 		hourly            bool
 		dailySummary      bool
@@ -323,8 +385,6 @@ func TestBuildDayStyleRenderContextsPopulateSharedFieldsAndPlanningModules(t *te
 		spcDiscussion     bool
 		story             bool
 		planning          bool
-		collected         bool
-		derived           bool
 	}
 	tests := []struct {
 		name               string
@@ -340,12 +400,11 @@ func TestBuildDayStyleRenderContextsPopulateSharedFieldsAndPlanningModules(t *te
 			wantDayparts:       3,
 			build: func(t *testing.T) result {
 				t.Helper()
-				collected := testCollected()
 				derived := testDailyDerived()
 				ctx, err := BuildDailyRenderContext(testDailyMetadata(), testDailySnapshot(t), Daily{
 					Summary:            "Daily summary.",
 					ForecastDiscussion: []string{"Daily discussion."},
-				}, collected, derived)
+				}, derived)
 				if err != nil {
 					t.Fatalf("BuildDailyRenderContext() error = %v", err)
 				}
@@ -355,7 +414,6 @@ func TestBuildDayStyleRenderContextsPopulateSharedFieldsAndPlanningModules(t *te
 					generatedAtLabel:  ctx.Report.GeneratedAtLabel,
 					timezone:          ctx.Report.Timezone,
 					validPeriod:       ctx.Report.ValidPeriod,
-					metadata:          ctx.Modules.Metadata != nil && ctx.Modules.Metadata.ReportID == report.Daily,
 					current:           ctx.Modules.CurrentConditions != nil,
 					hourly:            ctx.Modules.HourlyForecast != nil,
 					dailySummary:      ctx.Modules.DerivedDailySummary != nil,
@@ -368,8 +426,6 @@ func TestBuildDayStyleRenderContextsPopulateSharedFieldsAndPlanningModules(t *te
 					spcDiscussion:     ctx.Modules.SPCConvectiveDiscussion != nil,
 					story:             ctx.Modules.WeatherStory != nil,
 					planning:          ctx.Modules.DailyPlanning != nil,
-					collected:         ctx.Collected.FetchedAt.Equal(collected.FetchedAt),
-					derived:           len(ctx.Derived.DaypartSummaries) == len(derived.DaypartSummaries),
 				}
 			},
 		},
@@ -380,12 +436,11 @@ func TestBuildDayStyleRenderContextsPopulateSharedFieldsAndPlanningModules(t *te
 			wantDayparts:       2,
 			build: func(t *testing.T) result {
 				t.Helper()
-				collected := testCollected()
 				derived := testTodayDerived()
 				ctx, err := BuildTodayRenderContext(testTodayMetadata(), testTodaySnapshot(t), Today{
 					Summary:            "Today summary.",
 					ForecastDiscussion: []string{"Today discussion."},
-				}, collected, derived)
+				}, derived)
 				if err != nil {
 					t.Fatalf("BuildTodayRenderContext() error = %v", err)
 				}
@@ -395,7 +450,6 @@ func TestBuildDayStyleRenderContextsPopulateSharedFieldsAndPlanningModules(t *te
 					generatedAtLabel:  ctx.Report.GeneratedAtLabel,
 					timezone:          ctx.Report.Timezone,
 					validPeriod:       ctx.Report.ValidPeriod,
-					metadata:          ctx.Modules.Metadata != nil && ctx.Modules.Metadata.ReportID == report.Today,
 					current:           ctx.Modules.CurrentConditions != nil,
 					hourly:            ctx.Modules.HourlyForecast != nil,
 					dailySummary:      ctx.Modules.DerivedDailySummary != nil,
@@ -408,8 +462,6 @@ func TestBuildDayStyleRenderContextsPopulateSharedFieldsAndPlanningModules(t *te
 					spcDiscussion:     ctx.Modules.SPCConvectiveDiscussion != nil,
 					story:             ctx.Modules.WeatherStory != nil,
 					planning:          ctx.Modules.TodayPlanning != nil,
-					collected:         ctx.Collected.FetchedAt.Equal(collected.FetchedAt),
-					derived:           len(ctx.Derived.DaypartSummaries) == len(derived.DaypartSummaries),
 				}
 			},
 		},
@@ -420,12 +472,11 @@ func TestBuildDayStyleRenderContextsPopulateSharedFieldsAndPlanningModules(t *te
 			wantDayparts:       2,
 			build: func(t *testing.T) result {
 				t.Helper()
-				collected := testCollected()
 				derived := testTomorrowDerived()
 				ctx, err := BuildTomorrowRenderContext(testTomorrowMetadata(), testTomorrowSnapshot(t), Tomorrow{
 					Summary:            "Tomorrow summary.",
 					ForecastDiscussion: []string{"Tomorrow discussion."},
-				}, collected, derived)
+				}, derived)
 				if err != nil {
 					t.Fatalf("BuildTomorrowRenderContext() error = %v", err)
 				}
@@ -435,7 +486,6 @@ func TestBuildDayStyleRenderContextsPopulateSharedFieldsAndPlanningModules(t *te
 					generatedAtLabel:  ctx.Report.GeneratedAtLabel,
 					timezone:          ctx.Report.Timezone,
 					validPeriod:       ctx.Report.ValidPeriod,
-					metadata:          ctx.Modules.Metadata != nil && ctx.Modules.Metadata.ReportID == report.Tomorrow,
 					current:           ctx.Modules.CurrentConditions != nil,
 					hourly:            ctx.Modules.HourlyForecast != nil,
 					dailySummary:      ctx.Modules.DerivedDailySummary != nil,
@@ -448,8 +498,6 @@ func TestBuildDayStyleRenderContextsPopulateSharedFieldsAndPlanningModules(t *te
 					spcDiscussion:     ctx.Modules.SPCConvectiveDiscussion != nil,
 					story:             ctx.Modules.WeatherStory != nil,
 					planning:          ctx.Modules.TomorrowPlanning != nil,
-					collected:         ctx.Collected.FetchedAt.Equal(collected.FetchedAt),
-					derived:           len(ctx.Derived.DaypartSummaries) == len(derived.DaypartSummaries),
 				}
 			},
 		},
@@ -473,7 +521,7 @@ func TestBuildDayStyleRenderContextsPopulateSharedFieldsAndPlanningModules(t *te
 			if !result.validPeriod.IsValid() {
 				t.Fatalf("validPeriod = %#v, want valid period", result.validPeriod)
 			}
-			if !result.metadata || !result.current || !result.hourly || !result.dailySummary || !result.daypartSummaries || !result.precip || !result.alerts || !result.outlooks || !result.discussion || !result.spcDiscussion || !result.story {
+			if !result.current || !result.hourly || !result.dailySummary || !result.daypartSummaries || !result.precip || !result.alerts || !result.outlooks || !result.discussion || !result.spcDiscussion || !result.story {
 				t.Fatalf("common modules = %#v, want all shared modules populated", result)
 			}
 			if result.dayparts != test.wantDayparts {
@@ -482,9 +530,6 @@ func TestBuildDayStyleRenderContextsPopulateSharedFieldsAndPlanningModules(t *te
 			if !result.planning {
 				t.Fatalf("planning = false, want %s planning module populated", test.name)
 			}
-			if !result.collected || !result.derived {
-				t.Fatalf("facts passthrough = collected:%t derived:%t, want both true", result.collected, result.derived)
-			}
 		})
 	}
 }
@@ -500,10 +545,9 @@ func TestBuildDailyRenderContext(t *testing.T) {
 		},
 		PrecipitationTiming: "The most likely rain window is from midafternoon into early evening.",
 	}
-	collected := testCollected()
 	derived := testDailyDerived()
 
-	ctx, err := BuildDailyRenderContext(metadata, snapshot, generated, collected, derived)
+	ctx, err := BuildDailyRenderContext(metadata, snapshot, generated, derived)
 	if err != nil {
 		t.Fatalf("BuildDailyRenderContext() error = %v", err)
 	}
@@ -519,9 +563,6 @@ func TestBuildDailyRenderContext(t *testing.T) {
 	if !ctx.Report.ValidPeriod.Start.Equal(metadata.ValidPeriod.Start) || !ctx.Report.ValidPeriod.End.Equal(metadata.ValidPeriod.End) || ctx.Report.Timezone != "America/Chicago" {
 		t.Fatalf("period/timezone = %#v/%q, want metadata passthrough", ctx.Report.ValidPeriod, ctx.Report.Timezone)
 	}
-	if ctx.Modules.Metadata == nil || ctx.Modules.Metadata.ReportID != report.Daily {
-		t.Fatalf("Modules.Metadata = %#v, want daily metadata", ctx.Modules.Metadata)
-	}
 	if ctx.Modules.CurrentConditions == nil || ctx.Modules.HourlyForecast == nil {
 		t.Fatalf("current/hourly modules = %#v/%#v, want available in render context", ctx.Modules.CurrentConditions, ctx.Modules.HourlyForecast)
 	}
@@ -552,13 +593,6 @@ func TestBuildDailyRenderContext(t *testing.T) {
 	if ctx.Modules.DailyPlanning.MorningReadiness[0] != "Take sunglasses early." {
 		t.Fatalf("Modules.DailyPlanning = %#v, want daily planning facts", ctx.Modules.DailyPlanning)
 	}
-	if !ctx.Collected.FetchedAt.Equal(collected.FetchedAt) {
-		t.Fatalf("Collected.FetchedAt = %s, want %s", ctx.Collected.FetchedAt, collected.FetchedAt)
-	}
-	if len(ctx.Derived.DaypartSummaries) != 2 {
-		t.Fatalf("Derived.DaypartSummaries = %#v, want passthrough facts", ctx.Derived.DaypartSummaries)
-	}
-
 	rendered, err := reporttemplate.Render("daily", ctx)
 	if err != nil {
 		t.Fatalf("Render() error = %v", err)
@@ -601,11 +635,11 @@ func TestBuildDailyRenderContextAllowsOmittedOptionalModules(t *testing.T) {
 	ctx, err := BuildDailyRenderContext(testDailyMetadata(), snapshot, Daily{
 		Summary:            "Dry weather is expected for the selected day.",
 		ForecastDiscussion: []string{"High pressure keeps conditions quiet."},
-	}, testCollected(), facts.DerivedFacts{})
+	}, facts.DerivedFacts{})
 	if err != nil {
 		t.Fatalf("BuildDailyRenderContext() error = %v", err)
 	}
-	if ctx.Modules.Metadata != nil || ctx.Modules.CurrentConditions != nil || ctx.Modules.PrecipTiming != nil || ctx.Modules.OutdoorWindows != nil || ctx.Modules.DailyPlanning != nil || len(ctx.Modules.Dayparts) != 0 {
+	if ctx.Modules.CurrentConditions != nil || ctx.Modules.PrecipTiming != nil || ctx.Modules.OutdoorWindows != nil || ctx.Modules.DailyPlanning != nil || len(ctx.Modules.Dayparts) != 0 {
 		t.Fatalf("Modules = %#v, want omitted optional modules", ctx.Modules)
 	}
 	rendered, err := reporttemplate.Render("daily", ctx)
@@ -632,10 +666,9 @@ func TestBuildTomorrowRenderContext(t *testing.T) {
 		},
 		PrecipitationTiming: "The most likely rain window is from midafternoon into early evening.",
 	}
-	collected := testCollected()
 	derived := testTomorrowDerived()
 
-	ctx, err := BuildTomorrowRenderContext(metadata, snapshot, generated, collected, derived)
+	ctx, err := BuildTomorrowRenderContext(metadata, snapshot, generated, derived)
 	if err != nil {
 		t.Fatalf("BuildTomorrowRenderContext() error = %v", err)
 	}
@@ -648,9 +681,6 @@ func TestBuildTomorrowRenderContext(t *testing.T) {
 	if ctx.Report.GeneratedAtLabel != "Sunday, June 14, 2026 at 9:14 AM" {
 		t.Fatalf("Report.GeneratedAtLabel = %q, want friendly generated-at label", ctx.Report.GeneratedAtLabel)
 	}
-	if ctx.Modules.Metadata == nil || ctx.Modules.Metadata.ReportID != report.Tomorrow {
-		t.Fatalf("Modules.Metadata = %#v, want tomorrow metadata", ctx.Modules.Metadata)
-	}
 	if ctx.Modules.CurrentConditions == nil || ctx.Modules.HourlyForecast == nil {
 		t.Fatalf("current/hourly modules = %#v/%#v, want available in render context", ctx.Modules.CurrentConditions, ctx.Modules.HourlyForecast)
 	}
@@ -675,13 +705,6 @@ func TestBuildTomorrowRenderContext(t *testing.T) {
 	if ctx.Modules.AlertDigest == nil || ctx.Modules.SPCConvectiveOutlooks == nil || ctx.Modules.AreaForecastDiscussion == nil || ctx.Modules.SPCConvectiveDiscussion == nil || ctx.Modules.WeatherStory == nil || ctx.Modules.TomorrowPlanning == nil {
 		t.Fatalf("optional modules missing from render context: %#v", ctx.Modules)
 	}
-	if !ctx.Collected.FetchedAt.Equal(collected.FetchedAt) {
-		t.Fatalf("Collected.FetchedAt = %s, want %s", ctx.Collected.FetchedAt, collected.FetchedAt)
-	}
-	if len(ctx.Derived.DaypartSummaries) != 2 {
-		t.Fatalf("Derived.DaypartSummaries = %#v, want passthrough facts", ctx.Derived.DaypartSummaries)
-	}
-
 	rendered, err := reporttemplate.Render("tomorrow", ctx)
 	if err != nil {
 		t.Fatalf("Render() error = %v", err)
@@ -721,11 +744,11 @@ func TestBuildTomorrowRenderContextAllowsOmittedOptionalModules(t *testing.T) {
 	ctx, err := BuildTomorrowRenderContext(testTomorrowMetadata(), snapshot, Tomorrow{
 		Summary:            "Dry weather is expected tomorrow.",
 		ForecastDiscussion: []string{"High pressure keeps conditions quiet."},
-	}, testCollected(), facts.DerivedFacts{})
+	}, facts.DerivedFacts{})
 	if err != nil {
 		t.Fatalf("BuildTomorrowRenderContext() error = %v", err)
 	}
-	if ctx.Modules.Metadata != nil || ctx.Modules.CurrentConditions != nil || ctx.Modules.PrecipTiming != nil || len(ctx.Modules.Dayparts) != 0 {
+	if ctx.Modules.CurrentConditions != nil || ctx.Modules.PrecipTiming != nil || len(ctx.Modules.Dayparts) != 0 {
 		t.Fatalf("Modules = %#v, want omitted optional modules", ctx.Modules)
 	}
 	rendered, err := reporttemplate.Render("tomorrow", ctx)
@@ -821,10 +844,6 @@ func testTodayMetadata() briefing.PreparedIdentity {
 	}
 }
 
-func testCollected() facts.CollectedFacts {
-	return facts.CollectedFacts{FetchedAt: time.Date(2026, 5, 29, 13, 31, 0, 0, time.UTC)}
-}
-
 func testDerived() facts.DerivedFacts {
 	return facts.DerivedFacts{PrecipTiming: forecast.PrecipTiming{ThunderMentioned: true}}
 }
@@ -878,6 +897,7 @@ func testTodaySnapshot(t *testing.T) module.Snapshot {
 				Units:       "imperial",
 				Timezone:    "America/Chicago",
 				ValidPeriod: testTodayMetadata().ValidPeriod,
+				Location:    testTodayMetadata().Location,
 			},
 		},
 		{
@@ -1010,6 +1030,7 @@ func testDailySnapshot(t *testing.T) module.Snapshot {
 				Units:       "imperial",
 				Timezone:    "America/Chicago",
 				ValidPeriod: testDailyMetadata().ValidPeriod,
+				Location:    testDailyMetadata().Location,
 			},
 		},
 		{
@@ -1289,6 +1310,7 @@ func testTomorrowSnapshot(t *testing.T) module.Snapshot {
 				Units:       "imperial",
 				Timezone:    "America/Chicago",
 				ValidPeriod: testTomorrowMetadata().ValidPeriod,
+				Location:    testTomorrowMetadata().Location,
 			},
 		},
 		{

internal/reporttemplate/reporttemplate_test.go

@@ -704,6 +704,26 @@ func TestRenderDaypartTemplatesUseRichHelperFields(t *testing.T) {
 	}
 }
 
+func TestRenderTodayUsesDaypartFallbackWhenRowsAreNotDisplayable(t *testing.T) {
+	rendered, err := Render("today", testTodayRenderContext{
+		Report:        testTodayReportContext{Title: "Today", ForecastDateLabel: "Monday, June 15, 2026"},
+		GeneratedText: testTomorrowGeneratedText{Summary: "Today summary."},
+		Modules: testTodayModules{Dayparts: []testTomorrowDaypart{
+			{Key: "morning", Summary: testDaypartSummary{DisplayName: "Morning"}},
+		}},
+	})
+	if err != nil {
+		t.Fatalf("Render() error = %v", err)
+	}
+	text := string(rendered)
+	if !strings.Contains(text, "## Daypart Forecast\n- No daypart forecast details are available.") {
+		t.Fatalf("rendered template missing daypart fallback:\n%s", text)
+	}
+	if strings.Contains(text, "- **Morning:**") {
+		t.Fatalf("rendered template included an unavailable daypart row:\n%s", text)
+	}
+}
+
 func TestRenderTomorrowOmitsPrecipitationTimingWithoutWindows(t *testing.T) {
 	rendered, err := Render("tomorrow", testTomorrowRenderContext{
 		Report: testTomorrowReportContext{
@@ -1013,6 +1033,15 @@ type testTodayModules struct {
 	TodayPlanning         *testTodayPlanning
 }
 
+func (modules testTodayModules) HasDaypartDetails() bool {
+	for _, daypart := range modules.Dayparts {
+		if daypart.Summary.DominantConditionDisplay != "" || daypart.Summary.DominantCondition != "" {
+			return true
+		}
+	}
+	return false
+}
+
 type testDailyModules struct {
 	Dayparts              []testDailyDaypart
 	PrecipTiming          *testPrecipTiming

internal/reporttemplate/templates/partials/today_daypart_forecast.md.tmpl

@@ -1,5 +1,5 @@
 {{ define "today_daypart_forecast" }}## Daypart Forecast
-{{ with .Modules.Dayparts }}{{ range . }}{{ $daypart := . }}{{ if or .Summary.DominantConditionDisplay .Summary.DominantCondition }}- **{{ if .Summary.DisplayName }}{{ .Summary.DisplayName }}{{ else }}{{ .Key }}{{ end }}:** {{ with .Summary.DominantConditionDisplay }}{{ . }}{{ else }}{{ with .Summary.DominantCondition }}{{ . }}{{ end }}{{ end }}{{ if eq .Summary.TemperatureTrend "rising" }}{{ with .Summary.TemperatureStartPhraseF }}, with temperatures rising from the {{ . }}{{ with $daypart.Summary.TemperatureEndPhraseF }} to the {{ . }}{{ end }}{{ end }}{{ else if eq .Summary.TemperatureTrend "falling" }}{{ with .Summary.TemperatureStartPhraseF }}, with temperatures falling from the {{ . }}{{ with $daypart.Summary.TemperatureEndPhraseF }} to the {{ . }}{{ end }}{{ end }}{{ else if eq .Summary.TemperatureTrend "peaking" }}{{ with .Summary.TemperaturePeakPhraseF }}, with temperatures peaking in the {{ . }}{{ end }}{{ else }}{{ with .Summary.TemperatureSteadyPhraseF }}, with temperatures in the {{ . }}{{ else }}{{ with .Summary.TemperaturePhraseF }}, with temperatures in the {{ . }}{{ end }}{{ end }}{{ end }}.{{ if .Summary.MentionPrecipitation }}{{ with .Summary.MaxPopPercent }} Chance of precipitation is {{ . }}%.{{ end }}{{ end }}
+{{ if .Modules.HasDaypartDetails }}{{ range .Modules.Dayparts }}{{ $daypart := . }}{{ if or .Summary.DominantConditionDisplay .Summary.DominantCondition }}- **{{ if .Summary.DisplayName }}{{ .Summary.DisplayName }}{{ else }}{{ .Key }}{{ end }}:** {{ with .Summary.DominantConditionDisplay }}{{ . }}{{ else }}{{ with .Summary.DominantCondition }}{{ . }}{{ end }}{{ end }}{{ if eq .Summary.TemperatureTrend "rising" }}{{ with .Summary.TemperatureStartPhraseF }}, with temperatures rising from the {{ . }}{{ with $daypart.Summary.TemperatureEndPhraseF }} to the {{ . }}{{ end }}{{ end }}{{ else if eq .Summary.TemperatureTrend "falling" }}{{ with .Summary.TemperatureStartPhraseF }}, with temperatures falling from the {{ . }}{{ with $daypart.Summary.TemperatureEndPhraseF }} to the {{ . }}{{ end }}{{ end }}{{ else if eq .Summary.TemperatureTrend "peaking" }}{{ with .Summary.TemperaturePeakPhraseF }}, with temperatures peaking in the {{ . }}{{ end }}{{ else }}{{ with .Summary.TemperatureSteadyPhraseF }}, with temperatures in the {{ . }}{{ else }}{{ with .Summary.TemperaturePhraseF }}, with temperatures in the {{ . }}{{ end }}{{ end }}{{ end }}.{{ if .Summary.MentionPrecipitation }}{{ with .Summary.MaxPopPercent }} Chance of precipitation is {{ . }}%.{{ end }}{{ end }}
 {{ end }}{{ end }}{{ else }}- No daypart forecast details are available.
 {{ end }}
 {{ end }}