Declare only the tables and columns pixa writes and reads (closes #310)

Removes output_content and request_cache, which nothing writes, and every
column that was written but never read: the host, path, query, content_type
and fetched_at of source_content, the content_type and created_at of
variant_content, and the status_code, error_message and fetched_at of
negative_cache.

StoreSource no longer takes the fetch result and LookupSource returns only
the source key. StoreVariant no longer takes a content type and
StoreNegative no longer takes a status code or message, so
extractStatusCode and the status constants, which only fed status_code,
are gone. Reconciliation adopts a variant file without opening it, as its
row no longer records a content type. Tests that set or checked a removed
column follow.

Model: opus-5-5

TODO.md

@@ -30,6 +30,15 @@ P2: security: per-origin rate limiting
 
 # Completed Steps
 
+- 2026-10-21 the schema file declares only the tables and columns pixa writes
+  and reads (closes #310): `output_content` and `request_cache` are gone, and so
+  are the columns nothing read: the host, path, query, `content_type` and
+  `fetched_at` of `source_content`, the `content_type` and `created_at` of
+  `variant_content`, and the `status_code`, `error_message` and `fetched_at` of
+  `negative_cache`. `StoreSource` no longer takes the fetch result,
+  `LookupSource` returns only the source key, `StoreVariant` no longer takes a
+  content type, `StoreNegative` no longer takes a status code or message, and
+  reconciliation adopts a variant file without reading its first bytes.
 - 2026-10-21 a cache hit makes no database call (closes #309): `Service.Get`
   opens the variant file with `Cache.GetVariant` and nothing else, with no
   existence check first. The content type comes from the file's first bytes; a

internal/database/concurrent_writes_internal_test.go

@@ -131,14 +131,13 @@ func writeLikeOneRequest(ctx context.Context, db *sql.DB, key string) error {
 	}
 
 	_, err = db.ExecContext(ctx, `INSERT INTO source_content
-		(source_key, source_host, source_path, content_type, size_bytes)
-		VALUES (?, 'example.com', '/image.png', 'image/png', 1)`, key)
+		(source_key, size_bytes) VALUES (?, 1)`, key)
 	if err != nil {
 		return fmt.Errorf("storing a source: %w", err)
 	}
 
 	_, err = db.ExecContext(ctx, `INSERT INTO variant_content
-		(cache_key, size_bytes, content_type) VALUES (?, 1, 'image/png')`, key)
+		(cache_key, size_bytes) VALUES (?, 1)`, key)
 	if err != nil {
 		return fmt.Errorf("recording a transformed image: %w", err)
 	}

internal/database/database_internal_test.go

@@ -159,10 +159,7 @@ func TestApplyMigrations_CreatesSchemaAndTables(t *testing.T) {
 	}
 
 	// Verify that the application tables created by 001.sql exist.
-	tables := []string{
-		"source_content", "output_content",
-		"request_cache", "negative_cache", "cache_stats",
-	}
+	tables := []string{"source_content", "negative_cache", "cache_stats"}
 	for _, table := range tables {
 		var count int
 

internal/db/migrations/001_schema.sql

@@ -6,12 +6,7 @@
 -- is the SHA-256 of the source's host, path and query
 CREATE TABLE IF NOT EXISTS source_content (
     source_key TEXT PRIMARY KEY,
-    source_host TEXT NOT NULL,
-    source_path TEXT NOT NULL,
-    source_query TEXT NOT NULL DEFAULT '',
-    content_type TEXT NOT NULL,
     size_bytes INTEGER NOT NULL,
-    fetched_at DATETIME DEFAULT CURRENT_TIMESTAMP,
     last_accessed_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
 );
 CREATE INDEX IF NOT EXISTS idx_source_content_last_accessed
@@ -27,8 +22,6 @@ CREATE INDEX IF NOT EXISTS idx_source_content_last_accessed
 CREATE TABLE IF NOT EXISTS variant_content (
     cache_key TEXT PRIMARY KEY,
     size_bytes INTEGER NOT NULL,
-    content_type TEXT NOT NULL,
-    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
     last_accessed_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
 );
 CREATE INDEX IF NOT EXISTS idx_variant_content_last_accessed
@@ -102,46 +95,14 @@ BEGIN
     WHERE id = 1;
 END;
 
--- Output/transformed content blobs
--- Not written: transformed images are stored in cache/variants and
--- tracked in variant_content above.
-CREATE TABLE IF NOT EXISTS output_content (
-    content_hash TEXT PRIMARY KEY,
-    content_type TEXT NOT NULL,
-    size_bytes INTEGER NOT NULL,
-    fetched_at DATETIME DEFAULT CURRENT_TIMESTAMP
-);
-
--- Request cache - maps full request params to output content
-CREATE TABLE IF NOT EXISTS request_cache (
-    id INTEGER PRIMARY KEY AUTOINCREMENT,
-    cache_key TEXT NOT NULL UNIQUE,
-    source_metadata_id INTEGER NOT NULL,
-    output_hash TEXT NOT NULL,
-    width INTEGER NOT NULL,
-    height INTEGER NOT NULL,
-    format TEXT NOT NULL,
-    quality INTEGER NOT NULL DEFAULT 85,
-    fit_mode TEXT NOT NULL DEFAULT 'cover',
-    fetched_at DATETIME DEFAULT CURRENT_TIMESTAMP,
-    access_count INTEGER NOT NULL DEFAULT 1,
-    FOREIGN KEY (source_metadata_id) REFERENCES source_metadata(id),
-    FOREIGN KEY (output_hash) REFERENCES output_content(content_hash)
-);
-CREATE INDEX IF NOT EXISTS idx_request_cache_key ON request_cache(cache_key);
-CREATE INDEX IF NOT EXISTS idx_request_cache_source ON request_cache(source_metadata_id);
-CREATE INDEX IF NOT EXISTS idx_request_cache_output ON request_cache(output_hash);
-CREATE INDEX IF NOT EXISTS idx_request_cache_fetched ON request_cache(fetched_at);
-
--- Negative cache for failed fetches (404s, timeouts, etc.)
+-- Negative cache: source URLs whose fetch failed with an upstream error
+-- status, or whose first bytes did not match their Content-Type. pixa does
+-- not fetch such a URL again until its row expires.
 CREATE TABLE IF NOT EXISTS negative_cache (
     id INTEGER PRIMARY KEY AUTOINCREMENT,
     source_host TEXT NOT NULL,
     source_path TEXT NOT NULL,
     source_query TEXT NOT NULL DEFAULT '',
-    status_code INTEGER NOT NULL,
-    error_message TEXT,
-    fetched_at DATETIME DEFAULT CURRENT_TIMESTAMP,
     expires_at DATETIME NOT NULL,
     UNIQUE(source_host, source_path, source_query)
 );

internal/imgcache/cache.go

@@ -12,7 +12,6 @@ import (
 	"sync/atomic"
 	"time"
 
-	"sneak.berlin/go/pixa/internal/httpfetcher"
 	"sneak.berlin/go/pixa/internal/imagerequest"
 )
 
@@ -212,7 +211,6 @@ func (c *Cache) StoreSource(
 	ctx context.Context,
 	req *imagerequest.Request,
 	content io.Reader,
-	result *httpfetcher.FetchResult,
 ) (imagerequest.SourceKey, error) {
 	if c.disabled {
 		return "", nil
@@ -231,17 +229,12 @@ func (c *Cache) StoreSource(
 	}
 
 	_, err = c.db.ExecContext(ctx, `
-		INSERT INTO source_content
-			(source_key, source_host, source_path, source_query,
-			 content_type, size_bytes)
-		VALUES (?, ?, ?, ?, ?, ?)
+		INSERT INTO source_content (source_key, size_bytes)
+		VALUES (?, ?)
 		ON CONFLICT(source_key) DO UPDATE SET
-			content_type = excluded.content_type,
 			size_bytes = excluded.size_bytes,
-			fetched_at = CURRENT_TIMESTAMP,
 			last_accessed_at = CURRENT_TIMESTAMP
-	`, string(key), req.Source.Host, req.Source.Path, req.Source.Query,
-		result.ContentType, size)
+	`, string(key), size)
 	if err != nil {
 		deleteErr := c.srcContent.Delete(key)
 		if deleteErr != nil {
@@ -262,8 +255,7 @@ func (c *Cache) StoreSource(
 // accounting insert is best-effort (the startup reconciliation pass
 // adopts any variant file that misses its accounting row).
 func (c *Cache) StoreVariant(
-	ctx context.Context, cacheKey imagerequest.VariantKey,
-	content io.Reader, contentType string,
+	ctx context.Context, cacheKey imagerequest.VariantKey, content io.Reader,
 ) error {
 	if c.disabled {
 		return nil
@@ -275,13 +267,12 @@ func (c *Cache) StoreVariant(
 	}
 
 	_, err = c.db.ExecContext(ctx, `
-		INSERT INTO variant_content (cache_key, size_bytes, content_type)
-		VALUES (?, ?, ?)
+		INSERT INTO variant_content (cache_key, size_bytes)
+		VALUES (?, ?)
 		ON CONFLICT(cache_key) DO UPDATE SET
 			size_bytes = excluded.size_bytes,
-			content_type = excluded.content_type,
 			last_accessed_at = CURRENT_TIMESTAMP
-	`, string(cacheKey), size, contentType)
+	`, string(cacheKey), size)
 	if err != nil {
 		c.log.Warn("failed to record variant in size accounting",
 			"cache_key", cacheKey, "error", err)
@@ -293,60 +284,54 @@ func (c *Cache) StoreVariant(
 }
 
 // LookupSource checks if we have cached source content for a request.
-// Returns the source key and content type if found, or empty values
-// if not; a row whose file is missing is not found. A source found has
-// its access time handed to the background writer without waiting (see
+// Returns the source key if found, or an empty key if not; a row whose
+// file is missing is not found. A source found has its access time
+// handed to the background writer without waiting (see
 // touchSourceContent); a disabled cache always reports no cached source.
 func (c *Cache) LookupSource(
 	ctx context.Context, req *imagerequest.Request,
-) (imagerequest.SourceKey, string, error) {
+) (imagerequest.SourceKey, error) {
 	if c.disabled {
-		return "", "", nil
+		return "", nil
 	}
 
 	key := req.Source.Key()
 
-	var contentType string
+	var foundKey string
 
 	err := c.db.QueryRowContext(ctx, `
-		SELECT content_type FROM source_content WHERE source_key = ?
-	`, string(key)).Scan(&contentType)
+		SELECT source_key FROM source_content WHERE source_key = ?
+	`, string(key)).Scan(&foundKey)
 
 	if errors.Is(err, sql.ErrNoRows) {
-		return "", "", nil
+		return "", nil
 	}
 
 	if err != nil {
-		return "", "", fmt.Errorf("failed to lookup source: %w", err)
+		return "", fmt.Errorf("failed to lookup source: %w", err)
 	}
 
 	// Verify the content file exists
 	if !c.srcContent.Exists(key) {
-		return "", "", nil
+		return "", nil
 	}
 
 	c.touchSourceContent(key)
 
-	return key, contentType, nil
+	return key, nil
 }
 
 // StoreNegative stores a negative cache entry for a failed fetch.
-func (c *Cache) StoreNegative(
-	ctx context.Context, req *imagerequest.Request, statusCode int, errMsg string,
-) error {
+func (c *Cache) StoreNegative(ctx context.Context, req *imagerequest.Request) error {
 	expiresAt := time.Now().UTC().Add(c.config.NegativeTTL)
 
 	_, err := c.db.ExecContext(ctx, `
 		INSERT INTO negative_cache
-			(source_host, source_path, source_query, status_code,
-			 error_message, expires_at)
-		VALUES (?, ?, ?, ?, ?, ?)
+			(source_host, source_path, source_query, expires_at)
+		VALUES (?, ?, ?, ?)
 		ON CONFLICT(source_host, source_path, source_query) DO UPDATE SET
-			status_code = excluded.status_code,
-			error_message = excluded.error_message,
-			fetched_at = CURRENT_TIMESTAMP,
 			expires_at = excluded.expires_at
-	`, req.Source.Host, req.Source.Path, req.Source.Query, statusCode, errMsg, expiresAt)
+	`, req.Source.Host, req.Source.Path, req.Source.Query, expiresAt)
 	if err != nil {
 		return fmt.Errorf("failed to insert negative cache: %w", err)
 	}

internal/imgcache/cache_hit_internal_test.go

@@ -16,9 +16,8 @@ import (
 )
 
 // TestGetVariant_ContentTypeFromFirstBytes stores an image in each output
-// format as a variant, recorded with the content type text/plain, and checks
-// that GetVariant serves it whole with the content type of its format, read
-// from the file.
+// format as a variant and checks that GetVariant serves it whole with the
+// content type of its format, read from the file.
 func TestGetVariant_ContentTypeFromFirstBytes(t *testing.T) {
 	t.Parallel()
 
@@ -48,7 +47,7 @@ func TestGetVariant_ContentTypeFromFirstBytes(t *testing.T) {
 
 		key := imagerequest.VariantKey("aabbccdd10" + string(format))
 
-		err = cache.StoreVariant(t.Context(), key, bytes.NewReader(image), "text/plain")
+		err = cache.StoreVariant(t.Context(), key, bytes.NewReader(image))
 		if err != nil {
 			t.Fatalf("StoreVariant(%s) error = %v", format, err)
 		}

internal/imgcache/cache_internal_test.go

@@ -22,41 +22,14 @@ func setupTestDB(t *testing.T) *sql.DB {
 	schema := `
 		CREATE TABLE source_content (
 			source_key TEXT PRIMARY KEY,
-			source_host TEXT NOT NULL,
-			source_path TEXT NOT NULL,
-			source_query TEXT NOT NULL DEFAULT '',
-			content_type TEXT NOT NULL,
 			size_bytes INTEGER NOT NULL,
-			fetched_at DATETIME DEFAULT CURRENT_TIMESTAMP,
 			last_accessed_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
 		);
-		CREATE TABLE output_content (
-			content_hash TEXT PRIMARY KEY,
-			content_type TEXT NOT NULL,
-			size_bytes INTEGER NOT NULL,
-			fetched_at DATETIME DEFAULT CURRENT_TIMESTAMP
-		);
-		CREATE TABLE request_cache (
-			id INTEGER PRIMARY KEY AUTOINCREMENT,
-			cache_key TEXT NOT NULL UNIQUE,
-			source_metadata_id INTEGER NOT NULL,
-			output_hash TEXT NOT NULL,
-			width INTEGER NOT NULL,
-			height INTEGER NOT NULL,
-			format TEXT NOT NULL,
-			quality INTEGER NOT NULL DEFAULT 85,
-			fit_mode TEXT NOT NULL DEFAULT 'cover',
-			fetched_at DATETIME DEFAULT CURRENT_TIMESTAMP,
-			access_count INTEGER NOT NULL DEFAULT 1
-		);
 		CREATE TABLE negative_cache (
 			id INTEGER PRIMARY KEY AUTOINCREMENT,
 			source_host TEXT NOT NULL,
 			source_path TEXT NOT NULL,
 			source_query TEXT NOT NULL DEFAULT '',
-			status_code INTEGER NOT NULL,
-			error_message TEXT,
-			fetched_at DATETIME DEFAULT CURRENT_TIMESTAMP,
 			expires_at DATETIME NOT NULL,
 			UNIQUE(source_host, source_path, source_query)
 		);
@@ -138,8 +111,8 @@ func TestCache_CleanExpired(t *testing.T) {
 	// Insert expired negative cache entry directly
 	_, err := db.ExecContext(ctx, `
 		INSERT INTO negative_cache
-			(source_host, source_path, source_query, status_code, expires_at)
-		VALUES ('example.com', '/old.jpg', '', 404, datetime('now', '-1 hour'))
+			(source_host, source_path, source_query, expires_at)
+		VALUES ('example.com', '/old.jpg', '', datetime('now', '-1 hour'))
 	`)
 	if err != nil {
 		t.Fatalf("failed to insert test data: %v", err)

internal/imgcache/cachesize_internal_test.go

@@ -39,9 +39,8 @@ func TestComputeDefaultMaxBytesCountsWhatTheCacheHolds(t *testing.T) {
 
 	// The cache now holds those 3 GiB, which leaves 1 GiB free.
 	_, err = cache.db.ExecContext(t.Context(),
-		`INSERT INTO variant_content (cache_key, size_bytes, content_type)
-		 VALUES (?, ?, ?)`,
-		string(testVariantKeyOne), 3221225472, testContentTypeWebP,
+		`INSERT INTO variant_content (cache_key, size_bytes) VALUES (?, ?)`,
+		string(testVariantKeyOne), 3221225472,
 	)
 	if err != nil {
 		t.Fatalf("failed to insert variant accounting row: %v", err)

internal/imgcache/eviction.go

@@ -51,11 +51,6 @@ const sqliteTimestampLayout = "2006-01-02 15:04:05"
 // writes (".tmp-*" patterns in the storage layer).
 const tempFilePrefix = ".tmp-"
 
-// fallbackContentType is the content type reconciliation records for a
-// variant file it adopts whose first bytes are not those of an output
-// format. Such a file is never served.
-const fallbackContentType = "application/octet-stream"
-
 // UsageBytes returns the total number of bytes of cache content
 // tracked in the database (source content blobs plus processed
 // variants). It reads the total the database keeps up to date as rows
@@ -590,25 +585,16 @@ func (c *Cache) reconcileVariantFile(
 }
 
 // adoptVariantFile inserts an accounting row for a variant file that
-// has none, using the file's size and modification time, and the content
-// type its first bytes show, as a hit reads it.
+// has none, using the file's size and modification time.
 func (c *Cache) adoptVariantFile(
 	ctx context.Context, info fs.FileInfo, cacheKey imagerequest.VariantKey,
 ) error {
 	modTime := info.ModTime().UTC().Format(sqliteTimestampLayout)
-	contentType := fallbackContentType
 
-	content, _, detectedType, err := c.variants.LoadWithContentType(cacheKey)
-	if err == nil {
-		_ = content.Close()
-		contentType = detectedType
-	}
-
-	_, err = c.db.ExecContext(ctx, `
-		INSERT INTO variant_content
-			(cache_key, size_bytes, content_type, created_at, last_accessed_at)
-		VALUES (?, ?, ?, ?, ?)
-	`, string(cacheKey), info.Size(), contentType, modTime, modTime)
+	_, err := c.db.ExecContext(ctx, `
+		INSERT INTO variant_content (cache_key, size_bytes, last_accessed_at)
+		VALUES (?, ?, ?)
+	`, string(cacheKey), info.Size(), modTime)
 	if err != nil {
 		return fmt.Errorf("failed to adopt variant file into accounting: %w", err)
 	}

internal/imgcache/eviction_internal_test.go

@@ -16,7 +16,6 @@ import (
 
 	"modernc.org/sqlite"
 	"sneak.berlin/go/pixa/internal/database"
-	"sneak.berlin/go/pixa/internal/httpfetcher"
 	"sneak.berlin/go/pixa/internal/imagerequest"
 )
 
@@ -102,17 +101,8 @@ func storeEvictionTestSource(
 		},
 	}
 
-	result := &httpfetcher.FetchResult{
-		StatusCode:    200,
-		ContentType:   testContentTypeJPEG,
-		ContentLength: int64(len(content)),
-		Headers: map[string][]string{
-			testHeaderContentType: {testContentTypeJPEG},
-		},
-	}
-
 	key, err := cache.StoreSource(
-		context.Background(), req, bytes.NewReader(content), result,
+		context.Background(), req, bytes.NewReader(content),
 	)
 	if err != nil {
 		t.Fatalf("StoreSource(%s%s) failed: %v", host, path, err)
@@ -128,7 +118,7 @@ func storeEvictionTestVariant(
 ) {
 	t.Helper()
 
-	err := cache.StoreVariant(t.Context(), key, bytes.NewReader(content), "image/webp")
+	err := cache.StoreVariant(t.Context(), key, bytes.NewReader(content))
 	if err != nil {
 		t.Fatalf("StoreVariant(%s) failed: %v", key, err)
 	}
@@ -437,20 +427,13 @@ func assertDisabledCacheWritesAreNoOps(
 	ctx := t.Context()
 
 	err := cache.StoreVariant(
-		ctx, imagerequest.CacheKey(req), bytes.NewReader([]byte("data")), "image/webp",
+		ctx, imagerequest.CacheKey(req), bytes.NewReader([]byte("data")),
 	)
 	if err != nil {
 		t.Fatalf("StoreVariant on disabled cache must be a no-op, got error: %v", err)
 	}
 
-	result := &httpfetcher.FetchResult{
-		StatusCode:    200,
-		ContentType:   testContentTypeJPEG,
-		ContentLength: 4,
-		Headers:       map[string][]string{},
-	}
-
-	key, err := cache.StoreSource(ctx, req, bytes.NewReader([]byte("data")), result)
+	key, err := cache.StoreSource(ctx, req, bytes.NewReader([]byte("data")))
 	if err != nil {
 		t.Fatalf("StoreSource on disabled cache must be a no-op, got error: %v", err)
 	}
@@ -469,14 +452,13 @@ func assertDisabledCacheReadsAlwaysMiss(
 
 	ctx := t.Context()
 
-	key, srcType, err := cache.LookupSource(ctx, req)
+	key, err := cache.LookupSource(ctx, req)
 	if err != nil {
 		t.Fatalf("LookupSource on disabled cache failed: %v", err)
 	}
 
-	if key != "" || srcType != "" {
-		t.Errorf("LookupSource on disabled cache = (%q, %q), want empty",
-			key, srcType)
+	if key != "" {
+		t.Errorf("LookupSource on disabled cache = %q, want empty", key)
 	}
 }
 
@@ -667,9 +649,8 @@ func TestStartEvictionReconcilesAccountingWithDisk(t *testing.T) {
 
 	// An accounting row whose file is missing must be dropped.
 	_, err = cache.db.ExecContext(t.Context(),
-		`INSERT INTO variant_content (cache_key, size_bytes, content_type)
-		 VALUES (?, ?, ?)`,
-		"deadbeef0001", 700, "image/webp",
+		`INSERT INTO variant_content (cache_key, size_bytes) VALUES (?, ?)`,
+		"deadbeef0001", 700,
 	)
 	if err != nil {
 		t.Fatalf("failed to insert stale variant accounting row: %v", err)

internal/imgcache/max_concurrent_processing_internal_test.go

@@ -77,7 +77,7 @@ func TestService_Get_WaitsForSlotBeforeReadingCachedSource(t *testing.T) {
 
 	_ = resp.Content.Close()
 
-	sourceKey, _, err := svc.cache.LookupSource(t.Context(),
+	sourceKey, err := svc.cache.LookupSource(t.Context(),
 		widthOnlyRequest(fixtures, 50))
 	if err != nil || sourceKey == "" {
 		t.Fatalf("LookupSource() = %q, %v; want the cached source",

internal/imgcache/negative_cache_internal_test.go

@@ -43,7 +43,7 @@ func TestNegativeCache_StoreAndCheck(t *testing.T) {
 	}
 
 	// Store a negative entry
-	err = cache.StoreNegative(ctx, req, 404, "not found")
+	err = cache.StoreNegative(ctx, req)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -82,7 +82,7 @@ func TestNegativeCache_Expired(t *testing.T) {
 	}
 
 	// Store a negative entry with very short TTL
-	err = cache.StoreNegative(ctx, req, 500, "server error")
+	err = cache.StoreNegative(ctx, req)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -120,8 +120,7 @@ func TestService_Get_ServesCachedVariantOfNegativeCachedURL(t *testing.T) {
 	_ = resp.Content.Close()
 
 	err = svc.cache.StoreNegative(t.Context(),
-		photoVariant(fixtures, 85, imagerequest.FitCover),
-		httpStatusBadGateway, "upstream answered 503")
+		photoVariant(fixtures, 85, imagerequest.FitCover))
 	if err != nil {
 		t.Fatalf("StoreNegative() error = %v", err)
 	}
@@ -147,7 +146,7 @@ func TestService_Get_ServesCachedVariantOfNegativeCachedURL(t *testing.T) {
 
 	_ = resp.Content.Close()
 
-	sourceKey, _, err := svc.cache.LookupSource(t.Context(),
+	sourceKey, err := svc.cache.LookupSource(t.Context(),
 		photoVariant(fixtures, 85, imagerequest.FitCover))
 	if err != nil || sourceKey == "" {
 		t.Fatalf("LookupSource() = %q, %v, want the cached source", sourceKey, err)
@@ -201,7 +200,7 @@ func TestEvictionLoopRemovesExpiredNegativeCacheRows(t *testing.T) {
 				Source: imagerequest.Source{Host: testHostExample, Path: "/gone.jpg"},
 			}
 
-			err = cache.StoreNegative(t.Context(), expired, 404, "not found")
+			err = cache.StoreNegative(t.Context(), expired)
 			if err != nil {
 				t.Fatalf("StoreNegative failed: %v", err)
 			}
@@ -210,8 +209,8 @@ func TestEvictionLoopRemovesExpiredNegativeCacheRows(t *testing.T) {
 
 			_, err = cache.db.ExecContext(t.Context(), `
 				INSERT INTO negative_cache
-					(source_host, source_path, status_code, expires_at)
-				VALUES (?, ?, 404, datetime('now', '+1 hour'))
+					(source_host, source_path, expires_at)
+				VALUES (?, ?, datetime('now', '+1 hour'))
 			`, testHostExample, notExpiredPath)
 			if err != nil {
 				t.Fatalf("failed to insert a row that has not expired: %v", err)
@@ -279,8 +278,8 @@ func TestCleanExpiredDeletesInBatches(t *testing.T) {
 
 	_, err = cache.db.ExecContext(ctx, `
 		INSERT INTO negative_cache
-			(source_host, source_path, status_code, expires_at)
-		VALUES (?, ?, 404, datetime('now', '+1 hour'))
+			(source_host, source_path, expires_at)
+		VALUES (?, ?, datetime('now', '+1 hour'))
 	`, testHostExample, notExpiredPath)
 	if err != nil {
 		t.Fatalf("failed to insert a row that has not expired: %v", err)
@@ -378,8 +377,8 @@ func insertExpiredNegativeCacheRows(t *testing.T, cache *Cache, count int) {
 	for i := range count {
 		_, err := cache.db.ExecContext(t.Context(), `
 			INSERT INTO negative_cache
-				(source_host, source_path, status_code, expires_at)
-			VALUES (?, ?, 404, datetime('now', '-1 hour'))
+				(source_host, source_path, expires_at)
+			VALUES (?, ?, datetime('now', '-1 hour'))
 		`, testHostExample, "/expired/"+strconv.Itoa(i)+".jpg")
 		if err != nil {
 			t.Fatalf("failed to insert an expired row: %v", err)

internal/imgcache/partial_cache_files_internal_test.go

@@ -65,7 +65,7 @@ func cachedSourcePath(
 ) string {
 	t.Helper()
 
-	sourceKey, _, err := svc.cache.LookupSource(t.Context(), req)
+	sourceKey, err := svc.cache.LookupSource(t.Context(), req)
 	if err != nil || sourceKey == "" {
 		t.Fatalf("LookupSource() = %q, %v; want the cached source", sourceKey, err)
 	}

internal/imgcache/pendingcounts_internal_test.go

@@ -364,7 +364,7 @@ func TestLookupSource_HandsAccessTimeToTheBackgroundWriter(t *testing.T) {
 	`
 	anHourAgoInDatabase := anHourAgo.UTC().Format(sqliteTimestampFormat)
 
-	found, _, err := cache.LookupSource(t.Context(), &imagerequest.Request{
+	found, err := cache.LookupSource(t.Context(), &imagerequest.Request{
 		Source: imagerequest.Source{Host: "example.com", Path: "/photo.jpg"},
 	})
 	if err != nil || found != key {

internal/imgcache/service.go

@@ -397,7 +397,7 @@ func (s *Service) processFromSourceOrFetch(
 	cacheKey imagerequest.VariantKey,
 ) (*processedVariant, error) {
 	// Check if we have cached source content
-	sourceKey, _, err := s.cache.LookupSource(ctx, req)
+	sourceKey, err := s.cache.LookupSource(ctx, req)
 	if err != nil {
 		s.log.Warn("source lookup failed", "error", err)
 	}
@@ -458,7 +458,7 @@ func (s *Service) fetchAndProcess(
 	if err != nil {
 		// Store negative cache for certain errors
 		if isNegativeCacheable(err) {
-			s.storeNegative(ctx, req, extractStatusCode(err), err)
+			s.storeNegative(ctx, req)
 		}
 
 		return nil, fmt.Errorf("upstream fetch failed: %w", err)
@@ -512,13 +512,13 @@ func (s *Service) fetchAndProcess(
 		s.log.Warn("source refused", "request_id", middleware.GetReqID(ctx),
 			"host", req.Source.Host, "path", req.Source.Path,
 			"content_type", fetchResult.ContentType, "error", err)
-		s.storeNegative(ctx, req, httpStatusUnsupportedMediaType, err)
+		s.storeNegative(ctx, req)
 
 		return nil, fmt.Errorf("content validation failed: %w", err)
 	}
 
 	// Store source content
-	_, err = s.cache.StoreSource(ctx, req, bytes.NewReader(sourceData), fetchResult)
+	_, err = s.cache.StoreSource(ctx, req, bytes.NewReader(sourceData))
 	if err != nil {
 		s.log.Warn("failed to store source content", "error", err)
 		// Continue even if caching fails
@@ -530,15 +530,13 @@ func (s *Service) fetchAndProcess(
 }
 
 // storeNegative stores a negative cache entry for req's source, whose fetch
-// failed with err, so the source is not fetched again until the entry
-// expires. A failure to store the entry is only logged.
-func (s *Service) storeNegative(
-	ctx context.Context, req *imagerequest.Request, statusCode int, err error,
-) {
-	storeErr := s.cache.StoreNegative(ctx, req, statusCode, err.Error())
-	if storeErr != nil {
+// failed, so the source is not fetched again until the entry expires. A
+// failure to store the entry is only logged.
+func (s *Service) storeNegative(ctx context.Context, req *imagerequest.Request) {
+	err := s.cache.StoreNegative(ctx, req)
+	if err != nil {
 		s.log.Warn("failed to store negative cache entry",
-			"host", req.Source.Host, "path", req.Source.Path, "error", storeErr)
+			"host", req.Source.Host, "path", req.Source.Path, "error", err)
 	}
 }
 
@@ -614,9 +612,7 @@ func (s *Service) processAndStore(
 	)
 
 	// Store variant to cache
-	err = s.cache.StoreVariant(
-		ctx, cacheKey, bytes.NewReader(processedData), processResult.ContentType,
-	)
+	err = s.cache.StoreVariant(ctx, cacheKey, bytes.NewReader(processedData))
 	if err != nil {
 		s.log.Warn("failed to store variant", "error", err)
 		// Continue even if caching fails
@@ -629,28 +625,11 @@ func (s *Service) processAndStore(
 	}, nil
 }
 
-// HTTP status codes for error responses.
-const (
-	httpStatusBadGateway           = 502
-	httpStatusInternalError        = 500
-	httpStatusUnsupportedMediaType = 415
-)
-
 // isNegativeCacheable returns true if the error should be cached.
 func isNegativeCacheable(err error) bool {
 	return errors.Is(err, httpfetcher.ErrUpstreamError)
 }
 
-// extractStatusCode extracts HTTP status code from error message.
-func extractStatusCode(err error) int {
-	// Default to 502 Bad Gateway for upstream errors
-	if errors.Is(err, httpfetcher.ErrUpstreamError) {
-		return httpStatusBadGateway
-	}
-
-	return httpStatusInternalError
-}
-
 // etagHashLength is the number of hash characters to use for ETags.
 const etagHashLength = 16
 

internal/imgcache/service_internal_test.go

@@ -549,17 +549,15 @@ func TestService_Get_Caching(t *testing.T) {
 
 // TestService_Get_ServesSourceAndVariantCachedTwoDaysAgo caches a source and
 // a variant of it and sets back two days every time pixa stored for them.
-// For the source: fetched_at and last_accessed_at in source_content, and the
-// access and modification times of its file. For the variant: created_at and
-// last_accessed_at in variant_content, and the access and modification times
-// of its file. It then checks that the variant is still served from the
-// cache and that a new variant is made from the cached source without
-// fetching it again.
+// For the source: last_accessed_at in source_content, and the access and
+// modification times of its file. For the variant: last_accessed_at in
+// variant_content, and the access and modification times of its file. It
+// then checks that the variant is still served from the cache and that a new
+// variant is made from the cached source without fetching it again.
 //
 // Left at the present: the files' status change and birth times, which a
 // program cannot set, and the times of the directories holding the files,
-// which other entries share. The request_cache and output_content tables are
-// never written.
+// which other entries share.
 func TestService_Get_ServesSourceAndVariantCachedTwoDaysAgo(t *testing.T) {
 	t.Parallel()
 
@@ -613,11 +611,6 @@ func backdateSource(
 	t.Helper()
 
 	key := req.Source.Key()
-	dbTime := when.UTC().Format(sqliteTimestampFormat)
-
-	updateOneRow(t, cache,
-		`UPDATE source_content SET fetched_at = ? WHERE source_key = ?`,
-		dbTime, string(key))
 	setSourceLastAccessed(t, cache, key, when)
 
 	path := cache.srcContent.keyToPath(key)
@@ -639,9 +632,6 @@ func backdateVariant(
 	key := imagerequest.CacheKey(req)
 	path := cache.variants.keyToPath(key)
 
-	updateOneRow(t, cache,
-		`UPDATE variant_content SET created_at = ? WHERE cache_key = ?`,
-		when.UTC().Format(sqliteTimestampFormat), string(key))
 	setVariantLastAccessed(t, cache, key, when)
 
 	err := os.Chtimes(path, when, when)
@@ -650,22 +640,6 @@ func backdateVariant(
 	}
 }
 
-// updateOneRow runs the UPDATE statement query and fails the test unless it
-// changed exactly one row.
-func updateOneRow(t *testing.T, cache *Cache, query string, args ...any) {
-	t.Helper()
-
-	result, err := cache.db.ExecContext(t.Context(), query, args...)
-	if err != nil {
-		t.Fatalf("%s: %v", query, err)
-	}
-
-	rows, err := result.RowsAffected()
-	if err != nil || rows != 1 {
-		t.Fatalf("%s: rows = %d, error = %v, want 1 row", query, rows, err)
-	}
-}
-
 func TestService_Get_DifferentSizes(t *testing.T) {
 	t.Parallel()
 

internal/imgcache/source_content_internal_test.go

@@ -7,7 +7,6 @@ import (
 	"path/filepath"
 	"testing"
 
-	"sneak.berlin/go/pixa/internal/httpfetcher"
 	"sneak.berlin/go/pixa/internal/imagerequest"
 )
 
@@ -32,10 +31,8 @@ func TestStoreSource_StoresIdenticalBytesOfTwoURLsTwice(t *testing.T) {
 	}
 
 	for sourcePath, key := range keys {
-		rows := countRows(t, cache, `
-			SELECT COUNT(*) FROM source_content
-			WHERE source_key = ? AND source_host = ? AND source_path = ?
-		`, string(key), testHostCDN, sourcePath)
+		rows := countRows(t, cache,
+			`SELECT COUNT(*) FROM source_content WHERE source_key = ?`, string(key))
 		if rows != 1 {
 			t.Errorf("%s has %d source_content rows, want 1", sourcePath, rows)
 		}
@@ -87,10 +84,10 @@ func TestEvictSourceBlob_LeavesSourceWithIdenticalBytesServed(t *testing.T) {
 		t.Errorf("the evicted source still has %d source_content rows", n)
 	}
 
-	kept, contentType, err := cache.LookupSource(t.Context(), &imagerequest.Request{
+	kept, err := cache.LookupSource(t.Context(), &imagerequest.Request{
 		Source: imagerequest.Source{Host: testHostCDN, Path: "/kept.jpg"},
 	})
-	t.Logf("LookupSource() of the kept source = %q, %q, error %v", kept, contentType, err)
+	t.Logf("LookupSource() of the kept source = %q, error %v", kept, err)
 
 	if err != nil || kept == "" {
 		t.Fatalf("LookupSource() of the kept source = %q, %v; want it cached", kept, err)
@@ -130,10 +127,8 @@ func TestStoreSource_FailedRowWriteLeavesNoFile(t *testing.T) {
 	req := &imagerequest.Request{
 		Source: imagerequest.Source{Host: testHostCDN, Path: testPathCat},
 	}
-	result := &httpfetcher.FetchResult{ContentType: testContentTypeJPEG}
-
 	key, err := cache.StoreSource(t.Context(), req,
-		bytes.NewReader([]byte("source bytes")), result)
+		bytes.NewReader([]byte("source bytes")))
 	t.Logf("StoreSource() = %q, error = %v", key, err)
 
 	if err == nil {

internal/imgcache/testutil_internal_test.go

@@ -20,12 +20,10 @@ import (
 
 // Shared test data literals, extracted as constants for goconst.
 const (
-	testHostCDN           = "cdn.example.com"
-	testHostExample       = "example.com"
-	testPathCat           = "/photos/cat.jpg"
-	testContentTypeJPEG   = "image/jpeg"
-	testContentTypeWebP   = "image/webp"
-	testHeaderContentType = "Content-Type"
+	testHostCDN         = "cdn.example.com"
+	testHostExample     = "example.com"
+	testPathCat         = "/photos/cat.jpg"
+	testContentTypeJPEG = "image/jpeg"
 )
 
 // TestFixtures contains paths to test files in the mock filesystem.

internal/server/image_proxy_internal_test.go

@@ -113,7 +113,7 @@ func TestImageProxyFlow(t *testing.T) {
 			}
 
 			checkSourceCached(t, db, stateDir, source)
-			checkVariantCached(t, db, stateDir, first.Body.Bytes(), tt.contentType)
+			checkVariantCached(t, db, stateDir, first.Body.Bytes())
 		})
 	}
 }
@@ -276,27 +276,19 @@ func checkSourceCached(t *testing.T, db *sql.DB, stateDir string, source []byte)
 }
 
 // checkVariantCached checks that the converted image served is recorded in
-// variant_content with contentType, and stored under its cache key in
-// cache/variants.
-func checkVariantCached(
-	t *testing.T, db *sql.DB, stateDir string, served []byte, contentType string,
-) {
+// variant_content, and stored under its cache key in cache/variants.
+func checkVariantCached(t *testing.T, db *sql.DB, stateDir string, served []byte) {
 	t.Helper()
 
-	var cacheKey, storedType string
+	var cacheKey string
 
 	err := db.QueryRowContext(t.Context(),
-		"SELECT cache_key, content_type FROM variant_content",
-	).Scan(&cacheKey, &storedType)
+		"SELECT cache_key FROM variant_content",
+	).Scan(&cacheKey)
 	if err != nil {
 		t.Fatalf("variant_content row: %v", err)
 	}
 
-	if storedType != contentType {
-		t.Errorf("variant_content content_type = %q, want %q",
-			storedType, contentType)
-	}
-
 	checkFile(t, filepath.Join(stateDir, "cache", "variants",
 		cacheKey[0:2], cacheKey[2:4], cacheKey), served)
 }