Enhanced Insights with daily summary embeddings

Bump to 0.5.0. Added daily summary generation job

migrations/2026-01-04-000000_add_message_embeddings/down.sql

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+-- Drop tables in reverse order
+DROP TABLE IF EXISTS vec_message_embeddings;
+DROP TABLE IF EXISTS message_embeddings;

migrations/2026-01-04-000000_add_message_embeddings/up.sql

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+-- Table for storing message metadata and embeddings
+-- Embeddings stored as BLOB for proof-of-concept
+-- For production with many contacts, consider using sqlite-vec extension
+CREATE TABLE message_embeddings (
+    id INTEGER PRIMARY KEY NOT NULL,
+    contact TEXT NOT NULL,
+    body TEXT NOT NULL,
+    timestamp BIGINT NOT NULL,
+    is_sent BOOLEAN NOT NULL,
+    embedding BLOB NOT NULL,
+    created_at BIGINT NOT NULL,
+    model_version TEXT NOT NULL,
+    -- Prevent duplicate embeddings for the same message
+    UNIQUE(contact, body, timestamp)
+);
+
+-- Indexes for efficient queries
+CREATE INDEX idx_message_embeddings_contact ON message_embeddings(contact);
+CREATE INDEX idx_message_embeddings_timestamp ON message_embeddings(timestamp);

migrations/2026-01-04-060000_add_daily_summaries/down.sql

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+DROP TABLE daily_conversation_summaries;

migrations/2026-01-04-060000_add_daily_summaries/up.sql

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+-- Daily conversation summaries for improved RAG quality
+-- Each row = one day's conversation with a contact, summarized by LLM and embedded
+
+CREATE TABLE daily_conversation_summaries (
+    id INTEGER PRIMARY KEY NOT NULL,
+    date TEXT NOT NULL,              -- ISO date "2024-08-15"
+    contact TEXT NOT NULL,            -- Contact name
+    summary TEXT NOT NULL,            -- LLM-generated 3-5 sentence summary
+    message_count INTEGER NOT NULL,   -- Number of messages in this day
+    embedding BLOB NOT NULL,          -- 768-dim vector of the summary
+    created_at BIGINT NOT NULL,       -- When this summary was generated
+    model_version TEXT NOT NULL,      -- "nomic-embed-text:v1.5"
+    UNIQUE(date, contact)
+);
+
+-- Indexes for efficient querying
+CREATE INDEX idx_daily_summaries_date ON daily_conversation_summaries(date);
+CREATE INDEX idx_daily_summaries_contact ON daily_conversation_summaries(contact);
+CREATE INDEX idx_daily_summaries_date_contact ON daily_conversation_summaries(date, contact);