Changeset 0.12.0 (#63)

server/database/migrations/007_attachments.sql

@@ -0,0 +1,32 @@
+-- 007_attachments.sql
+-- File attachments for chat messages (v0.12.0)
+--
+-- Blobs live in object storage (PVC / S3). This table holds metadata.
+-- Access control: always join through channels — attachments inherit
+-- channel membership as their access boundary.
+
+CREATE TABLE IF NOT EXISTS attachments (
+    id              UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    channel_id      UUID NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
+    user_id         UUID NOT NULL REFERENCES users(id),
+    message_id      UUID REFERENCES messages(id) ON DELETE SET NULL,
+    filename        VARCHAR(255) NOT NULL,
+    content_type    VARCHAR(127) NOT NULL,
+    size_bytes      BIGINT NOT NULL,
+    storage_key     TEXT NOT NULL,
+    extracted_text  TEXT,
+    metadata        JSONB DEFAULT '{}'::jsonb,
+    created_at      TIMESTAMPTZ DEFAULT NOW()
+);
+
+-- Primary access pattern: find attachments for a channel (auth check joins here)
+CREATE INDEX IF NOT EXISTS idx_attachments_channel ON attachments(channel_id);
+
+-- Quota calculation: SUM(size_bytes) WHERE user_id = $1
+CREATE INDEX IF NOT EXISTS idx_attachments_user_size ON attachments(user_id);
+
+-- Find attachments for a specific message
+CREATE INDEX IF NOT EXISTS idx_attachments_message ON attachments(message_id) WHERE message_id IS NOT NULL;
+
+-- Orphan cleanup: find unlinked attachments older than threshold
+CREATE INDEX IF NOT EXISTS idx_attachments_orphan ON attachments(created_at) WHERE message_id IS NULL;