commit 6ef81c8bc9984e37b43f03a11bc4ac03e2a6baf4 · bretton.dev/coves

+63
internal/db/migrations/016_create_comments_table.sql
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       -- +goose Up

     

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       -- Create comments table for AppView indexing

     

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       -- Comments are indexed from the firehose after being written to user repositories

     

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       CREATE TABLE comments (

     

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           id BIGSERIAL PRIMARY KEY,

     

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           uri TEXT UNIQUE NOT NULL,               -- AT-URI (at://commenter_did/social.coves.feed.comment/rkey)

     

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           cid TEXT NOT NULL,                      -- Content ID

     

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           rkey TEXT NOT NULL,                     -- Record key (TID)

     

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           commenter_did TEXT NOT NULL,            -- User who commented (from AT-URI repo field)

     

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           -- Threading structure (reply references)

     

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           root_uri TEXT NOT NULL,                 -- Strong reference to original post (at://...)

     

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           root_cid TEXT NOT NULL,                 -- CID of root post (version pinning)

     

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           parent_uri TEXT NOT NULL,               -- Strong reference to immediate parent (post or comment)

     

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           parent_cid TEXT NOT NULL,               -- CID of parent (version pinning)

     

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           -- Content (content is required per lexicon, others optional)

     

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           content TEXT NOT NULL,                  -- Comment text (max 3000 graphemes, 30000 bytes)

     

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           content_facets JSONB,                   -- Rich text facets (social.coves.richtext.facet)

     

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           embed JSONB,                            -- Embedded content (images, quoted posts)

     

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           content_labels JSONB,                   -- Self-applied labels (com.atproto.label.defs#selfLabels)

     

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           langs TEXT[],                           -- Languages (ISO 639-1, max 3)

     

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           -- Timestamps

     

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           created_at TIMESTAMPTZ NOT NULL,        -- Commenter's timestamp from record

     

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           indexed_at TIMESTAMPTZ NOT NULL DEFAULT NOW(), -- When indexed by AppView

     

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           deleted_at TIMESTAMPTZ,                 -- Soft delete (for firehose delete events)

     

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           -- Stats (denormalized for performance)

     

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           upvote_count INT NOT NULL DEFAULT 0,    -- Comments can be voted on (per vote lexicon)

     

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           downvote_count INT NOT NULL DEFAULT 0,

     

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           score INT NOT NULL DEFAULT 0,           -- upvote_count - downvote_count (for sorting)

     

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           reply_count INT NOT NULL DEFAULT 0      -- Number of direct replies to this comment

     

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           -- NO foreign key constraint on commenter_did to allow out-of-order indexing from Jetstream

     

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           -- Comment events may arrive before user events, which is acceptable since:

     

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           -- 1. Comments are authenticated by the user's PDS (security maintained)

     

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           -- 2. Orphaned comments from never-indexed users are harmless

     

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           -- 3. This prevents race conditions in the firehose consumer

     

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       );

     

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       -- Indexes for threading queries (most important for comment UX)

     

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       CREATE INDEX idx_comments_root ON comments(root_uri, created_at DESC) WHERE deleted_at IS NULL;

     

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       CREATE INDEX idx_comments_parent ON comments(parent_uri, created_at DESC) WHERE deleted_at IS NULL;

     

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       CREATE INDEX idx_comments_parent_score ON comments(parent_uri, score DESC, created_at DESC) WHERE deleted_at IS NULL;

     

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       -- Indexes for user queries

     

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       CREATE INDEX idx_comments_commenter ON comments(commenter_did, created_at DESC);

     

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       CREATE INDEX idx_comments_uri ON comments(uri);

     

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       -- Index for vote targeting (when votes target comments)

     

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       CREATE INDEX idx_comments_uri_active ON comments(uri) WHERE deleted_at IS NULL;

     

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       -- Comment on table

     

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       COMMENT ON TABLE comments IS 'Comments indexed from user repositories via Jetstream firehose consumer';

     

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       COMMENT ON COLUMN comments.uri IS 'AT-URI in format: at://commenter_did/social.coves.feed.comment/rkey';

     

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       COMMENT ON COLUMN comments.root_uri IS 'Strong reference to the original post that started the thread';

     

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       COMMENT ON COLUMN comments.parent_uri IS 'Strong reference to immediate parent (post or comment)';

     

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       COMMENT ON COLUMN comments.score IS 'Computed as upvote_count - downvote_count for ranking replies';

     

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       COMMENT ON COLUMN comments.content_labels IS 'Self-applied labels per com.atproto.label.defs#selfLabels (JSONB: {"values":[{"val":"nsfw","neg":false}]})';

     

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       -- +goose Down

     

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       DROP TABLE IF EXISTS comments CASCADE;